The document discusses future directions for the Windows CE operating system architecture. Windows CE 6.0 Beta introduces a new virtual memory model that removes the 32 process and 32MB per process limitations of CE 5.0. It allows 2GB of virtual memory per process and 32,000 processes. The new kernel moves critical components like filesystem and graphical window manager into kernel space for improved performance. New features in CE 6.0 Beta include large memory mapped file support, a secure loader, and monotonic clock support. The document outlines changes to system calls, drivers, compatibility, and real-time capabilities in the new architecture.
What is an operating System Structure?
We want a clear structure to let us apply an operating system to our particular needs because operating systems have complex structures. It is easier to create an operating system in pieces, much as we break down larger issues into smaller, more manageable subproblems. Every segment is also a part of the operating system. Operating system structure can be thought of as the strategy for connecting and incorporating various operating system components within the kernel. Operating systems are implemented using many types of structures, as will be discussed below:
SIMPLE STRUCTURE
It is the most straightforward operating system structure, but it lacks definition and is only appropriate for usage with tiny and restricted systems. Since the interfaces and degrees of functionality in this structure are clearly defined, programs are able to access I/O routines, which may result in unauthorized access to I/O procedures.
This exam measures your ability to accomplish the technical tasks listed below. The percentages indicate the relative weight of each major topic area on the exam. http://www.allpass4sure.com/microsoft-pdf-70-410.html
Presentation & discussion around low-level graphics APIs. This was a quickly made presentation that I put together for a discussion with Intel and fellow ISVs, thought it could be worth sharing
Solid-State diskA solid-state drive also known as a solid-state di.pdfsaahinmanpam
Solid-State disk
A solid-state drive also known as a solid-state disk though it contains neither a real disk nor a
drive speed to spin a disk is a solid-state storage machine. SSD is a pc storage space device that
uses solid state recollection to store in sequence. SSD uses non volatile NAND flash memory
which enable it to train data after the control is detached SSD is normally used to pass on to solid
state storage space that is filled in a hard disk form factor
Advantages are High read bandwidth, higher IOPS, higher mechanical reliability
Disadvantages are Limited capacity, lower streaming write bandwidth
Shell script
A shell script is a computer program planned to run via the UNIX shell, a command line analyst.
The different dialects of shell script are measured to be scripting languages. Usual operation
perform by shell script include file management, program execution, and printing text. Mainly
scripts are compilation of commands to be store in a file. The shell can read file and act the
commands as if they be type at the keyboard. order of n number of commands to you store text
file and execute the file in its place of inflowing commands
System calls
We can speak to For Performing some process users have to Request for a examine since the
System. For Making any Request a user will organize a individual call which is also known as
the System Call
Types of system cell
Process manage
File organization
Device managing
Information protection
Communication
Fork () and excel ()
Fork (): When you come up to to symbolic \"fork in the road\" you normally have two options to
arrest, and your option affects your upcoming. Computer programs arrive at this fork in the way
when they knock the fork () system call. The operating system will make a new method that is
right the same as the close relative process. The comeback value since the system call is the only
mode the process can verify if it was the offered process or a latest one. The comeback value to
the process will be the procedure ID (PID) of the infant, even as the child will get a comeback
value of 0.
Excel (): fork provide a approach for an existing procedure to create a new one, but what about
the case where the new procedure is not part of the same program as main process when a client
starts a command it wants to run in a new procedure, but it is distinct to the shell. This is
anywhere the exec system call comes into play. Exec will replace the satisfying of the now
association process with the in order from a program binary
System programs:
In computer an operating system is a program that acts as a mediator among the client of a
computer and computer hardware. In another method a current system is the set of system
programs. System programs provide a fitting surroundings for program expansion and
implementation con be divided into
File management
Status information
File change
Programming language maintain
Program load
Communication
Application programs
Microkernels
A small modular f.
Developing Distributed High-performance Computing Capabilities of an Open Sci...Globus
COVID-19 had an unprecedented impact on scientific collaboration. The pandemic and its broad response from the scientific community has forged new relationships among public health practitioners, mathematical modelers, and scientific computing specialists, while revealing critical gaps in exploiting advanced computing systems to support urgent decision making. Informed by our team’s work in applying high-performance computing in support of public health decision makers during the COVID-19 pandemic, we present how Globus technologies are enabling the development of an open science platform for robust epidemic analysis, with the goal of collaborative, secure, distributed, on-demand, and fast time-to-solution analyses to support public health.
What is an operating System Structure?
We want a clear structure to let us apply an operating system to our particular needs because operating systems have complex structures. It is easier to create an operating system in pieces, much as we break down larger issues into smaller, more manageable subproblems. Every segment is also a part of the operating system. Operating system structure can be thought of as the strategy for connecting and incorporating various operating system components within the kernel. Operating systems are implemented using many types of structures, as will be discussed below:
SIMPLE STRUCTURE
It is the most straightforward operating system structure, but it lacks definition and is only appropriate for usage with tiny and restricted systems. Since the interfaces and degrees of functionality in this structure are clearly defined, programs are able to access I/O routines, which may result in unauthorized access to I/O procedures.
This exam measures your ability to accomplish the technical tasks listed below. The percentages indicate the relative weight of each major topic area on the exam. http://www.allpass4sure.com/microsoft-pdf-70-410.html
Presentation & discussion around low-level graphics APIs. This was a quickly made presentation that I put together for a discussion with Intel and fellow ISVs, thought it could be worth sharing
Solid-State diskA solid-state drive also known as a solid-state di.pdfsaahinmanpam
Solid-State disk
A solid-state drive also known as a solid-state disk though it contains neither a real disk nor a
drive speed to spin a disk is a solid-state storage machine. SSD is a pc storage space device that
uses solid state recollection to store in sequence. SSD uses non volatile NAND flash memory
which enable it to train data after the control is detached SSD is normally used to pass on to solid
state storage space that is filled in a hard disk form factor
Advantages are High read bandwidth, higher IOPS, higher mechanical reliability
Disadvantages are Limited capacity, lower streaming write bandwidth
Shell script
A shell script is a computer program planned to run via the UNIX shell, a command line analyst.
The different dialects of shell script are measured to be scripting languages. Usual operation
perform by shell script include file management, program execution, and printing text. Mainly
scripts are compilation of commands to be store in a file. The shell can read file and act the
commands as if they be type at the keyboard. order of n number of commands to you store text
file and execute the file in its place of inflowing commands
System calls
We can speak to For Performing some process users have to Request for a examine since the
System. For Making any Request a user will organize a individual call which is also known as
the System Call
Types of system cell
Process manage
File organization
Device managing
Information protection
Communication
Fork () and excel ()
Fork (): When you come up to to symbolic \"fork in the road\" you normally have two options to
arrest, and your option affects your upcoming. Computer programs arrive at this fork in the way
when they knock the fork () system call. The operating system will make a new method that is
right the same as the close relative process. The comeback value since the system call is the only
mode the process can verify if it was the offered process or a latest one. The comeback value to
the process will be the procedure ID (PID) of the infant, even as the child will get a comeback
value of 0.
Excel (): fork provide a approach for an existing procedure to create a new one, but what about
the case where the new procedure is not part of the same program as main process when a client
starts a command it wants to run in a new procedure, but it is distinct to the shell. This is
anywhere the exec system call comes into play. Exec will replace the satisfying of the now
association process with the in order from a program binary
System programs:
In computer an operating system is a program that acts as a mediator among the client of a
computer and computer hardware. In another method a current system is the set of system
programs. System programs provide a fitting surroundings for program expansion and
implementation con be divided into
File management
Status information
File change
Programming language maintain
Program load
Communication
Application programs
Microkernels
A small modular f.
Developing Distributed High-performance Computing Capabilities of an Open Sci...Globus
COVID-19 had an unprecedented impact on scientific collaboration. The pandemic and its broad response from the scientific community has forged new relationships among public health practitioners, mathematical modelers, and scientific computing specialists, while revealing critical gaps in exploiting advanced computing systems to support urgent decision making. Informed by our team’s work in applying high-performance computing in support of public health decision makers during the COVID-19 pandemic, we present how Globus technologies are enabling the development of an open science platform for robust epidemic analysis, with the goal of collaborative, secure, distributed, on-demand, and fast time-to-solution analyses to support public health.
A Comprehensive Look at Generative AI in Retail App Testing.pdfkalichargn70th171
Traditional software testing methods are being challenged in retail, where customer expectations and technological advancements continually shape the landscape. Enter generative AI—a transformative subset of artificial intelligence technologies poised to revolutionize software testing.
How Recreation Management Software Can Streamline Your Operations.pptxwottaspaceseo
Recreation management software streamlines operations by automating key tasks such as scheduling, registration, and payment processing, reducing manual workload and errors. It provides centralized management of facilities, classes, and events, ensuring efficient resource allocation and facility usage. The software offers user-friendly online portals for easy access to bookings and program information, enhancing customer experience. Real-time reporting and data analytics deliver insights into attendance and preferences, aiding in strategic decision-making. Additionally, effective communication tools keep participants and staff informed with timely updates. Overall, recreation management software enhances efficiency, improves service delivery, and boosts customer satisfaction.
OpenFOAM solver for Helmholtz equation, helmholtzFoam / helmholtzBubbleFoamtakuyayamamoto1800
In this slide, we show the simulation example and the way to compile this solver.
In this solver, the Helmholtz equation can be solved by helmholtzFoam. Also, the Helmholtz equation with uniformly dispersed bubbles can be simulated by helmholtzBubbleFoam.
Enterprise Resource Planning System includes various modules that reduce any business's workload. Additionally, it organizes the workflows, which drives towards enhancing productivity. Here are a detailed explanation of the ERP modules. Going through the points will help you understand how the software is changing the work dynamics.
To know more details here: https://blogs.nyggs.com/nyggs/enterprise-resource-planning-erp-system-modules/
AI Pilot Review: The World’s First Virtual Assistant Marketing SuiteGoogle
AI Pilot Review: The World’s First Virtual Assistant Marketing Suite
👉👉 Click Here To Get More Info 👇👇
https://sumonreview.com/ai-pilot-review/
AI Pilot Review: Key Features
✅Deploy AI expert bots in Any Niche With Just A Click
✅With one keyword, generate complete funnels, websites, landing pages, and more.
✅More than 85 AI features are included in the AI pilot.
✅No setup or configuration; use your voice (like Siri) to do whatever you want.
✅You Can Use AI Pilot To Create your version of AI Pilot And Charge People For It…
✅ZERO Manual Work With AI Pilot. Never write, Design, Or Code Again.
✅ZERO Limits On Features Or Usages
✅Use Our AI-powered Traffic To Get Hundreds Of Customers
✅No Complicated Setup: Get Up And Running In 2 Minutes
✅99.99% Up-Time Guaranteed
✅30 Days Money-Back Guarantee
✅ZERO Upfront Cost
See My Other Reviews Article:
(1) TubeTrivia AI Review: https://sumonreview.com/tubetrivia-ai-review
(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
(4) AI Ebook Suite Review: https://sumonreview.com/ai-ebook-suite-review
Providing Globus Services to Users of JASMIN for Environmental Data AnalysisGlobus
JASMIN is the UK’s high-performance data analysis platform for environmental science, operated by STFC on behalf of the UK Natural Environment Research Council (NERC). In addition to its role in hosting the CEDA Archive (NERC’s long-term repository for climate, atmospheric science & Earth observation data in the UK), JASMIN provides a collaborative platform to a community of around 2,000 scientists in the UK and beyond, providing nearly 400 environmental science projects with working space, compute resources and tools to facilitate their work. High-performance data transfer into and out of JASMIN has always been a key feature, with many scientists bringing model outputs from supercomputers elsewhere in the UK, to analyse against observational or other model data in the CEDA Archive. A growing number of JASMIN users are now realising the benefits of using the Globus service to provide reliable and efficient data movement and other tasks in this and other contexts. Further use cases involve long-distance (intercontinental) transfers to and from JASMIN, and collecting results from a mobile atmospheric radar system, pushing data to JASMIN via a lightweight Globus deployment. We provide details of how Globus fits into our current infrastructure, our experience of the recent migration to GCSv5.4, and of our interest in developing use of the wider ecosystem of Globus services for the benefit of our user community.
Large Language Models and the End of ProgrammingMatt Welsh
Talk by Matt Welsh at Craft Conference 2024 on the impact that Large Language Models will have on the future of software development. In this talk, I discuss the ways in which LLMs will impact the software industry, from replacing human software developers with AI, to replacing conventional software with models that perform reasoning, computation, and problem-solving.
In 2015, I used to write extensions for Joomla, WordPress, phpBB3, etc and I ...Juraj Vysvader
In 2015, I used to write extensions for Joomla, WordPress, phpBB3, etc and I didn't get rich from it but it did have 63K downloads (powered possible tens of thousands of websites).
TROUBLESHOOTING 9 TYPES OF OUTOFMEMORYERRORTier1 app
Even though at surface level ‘java.lang.OutOfMemoryError’ appears as one single error; underlyingly there are 9 types of OutOfMemoryError. Each type of OutOfMemoryError has different causes, diagnosis approaches and solutions. This session equips you with the knowledge, tools, and techniques needed to troubleshoot and conquer OutOfMemoryError in all its forms, ensuring smoother, more efficient Java applications.
SOCRadar Research Team: Latest Activities of IntelBrokerSOCRadar
The European Union Agency for Law Enforcement Cooperation (Europol) has suffered an alleged data breach after a notorious threat actor claimed to have exfiltrated data from its systems. Infamous data leaker IntelBroker posted on the even more infamous BreachForums hacking forum, saying that Europol suffered a data breach this month.
The alleged breach affected Europol agencies CCSE, EC3, Europol Platform for Experts, Law Enforcement Forum, and SIRIUS. Infiltration of these entities can disrupt ongoing investigations and compromise sensitive intelligence shared among international law enforcement agencies.
However, this is neither the first nor the last activity of IntekBroker. We have compiled for you what happened in the last few days. To track such hacker activities on dark web sources like hacker forums, private Telegram channels, and other hidden platforms where cyber threats often originate, you can check SOCRadar’s Dark Web News.
Stay Informed on Threat Actors’ Activity on the Dark Web with SOCRadar!
Into the Box Keynote Day 2: Unveiling amazing updates and announcements for modern CFML developers! Get ready for exciting releases and updates on Ortus tools and products. Stay tuned for cutting-edge innovations designed to boost your productivity.
Code reviews are vital for ensuring good code quality. They serve as one of our last lines of defense against bugs and subpar code reaching production.
Yet, they often turn into annoying tasks riddled with frustration, hostility, unclear feedback and lack of standards. How can we improve this crucial process?
In this session we will cover:
- The Art of Effective Code Reviews
- Streamlining the Review Process
- Elevating Reviews with Automated Tools
By the end of this presentation, you'll have the knowledge on how to organize and improve your code review proces
Globus Connect Server Deep Dive - GlobusWorld 2024Globus
We explore the Globus Connect Server (GCS) architecture and experiment with advanced configuration options and use cases. This content is targeted at system administrators who are familiar with GCS and currently operate—or are planning to operate—broader deployments at their institution.
We describe the deployment and use of Globus Compute for remote computation. This content is aimed at researchers who wish to compute on remote resources using a unified programming interface, as well as system administrators who will deploy and operate Globus Compute services on their research computing infrastructure.
Top Features to Include in Your Winzo Clone App for Business Growth (4).pptxrickgrimesss22
Discover the essential features to incorporate in your Winzo clone app to boost business growth, enhance user engagement, and drive revenue. Learn how to create a compelling gaming experience that stands out in the competitive market.
Top Features to Include in Your Winzo Clone App for Business Growth (4).pptx
Future Direction of WIndows CE System Architecture.ppt
1. Future Directions For The
Windows CE Operating
System Architecture
John Hatch
Program Manager
2. Agenda
Overview - Introduction
5.0 – Overview
6.0 Beta – Overview
New Features
Performance and Size
Compatibility
Drivers Overview
Real-time
3. Windows CE Overview
Targeted to embedded devices
PPC, Smartphones, STBs, Thin clients, AutoPC,
PMC, control panels, robots, etc.
Benefits
Flexible, adaptable, configurable, small
Supports ARM, MIPS, SH, x86
Real-time
Simple driver model
Power conscious
Shared source
Tiered licensing model
4. Windows CE Overview
However, Windows CE 5.0 has a memory
model limitation
It only supports 32 processes and 32 MB
per process
These limitations has now been removed
with Windows CE 6.0
New Virtual Memory Model
6. CE 5.0 Memory Model
Virtual Memory Map
2 GB for Kernel
Single 2 GB mapping for all processes
Divided up into 32 MB “slots”
32 Process Limit
Each process has one 32 MB slot
32 slots for processes
Shared memory
Upper half of user space is shared memory
Read/Write by all processes
7. Windows CE 5.0 Memory Model
32 Slots for
Processes
Single
2 GB VM
for all
Processes
2 GB
Kernel
Space
Execution Slot and
Shared DLL Slot
Shared Memory
Kernel
Slot 0 – Execution
Slot 1 – ROM DLLs
Slot 2 – Filesys.exe
Slot 3 – Device.exe
Slot 4 – GWES.exe
Slot 5 – Services.exe
Slot 31
Slot 32
Slot 33
:
:
Slot 6
8. Windows CE 5.0 System Calls
Thunked calls that cause prefetch
data abort
Kernel catches the exception
Dispatches the kernel to the right service
User thread “migrates” into the service
Kernel changes the threads permissions
Fixes up the pointers
Swaps in the service
Thread runs in service
Returns unwind the operation
10. Introducing The New Kernel
2 GB of Virtual Memory per process
32,000 processes
Unified Kernel
Critical OS components moved into
kernel space
Improved system performance
Increased security and robustness
High degree of backwards compatibility
11. Windows CE 6.0
Beta Memory Model
Process Code
User VM
User VM
Memory Mapped files
User DLLs
Kernel
Filesystem
GWES
Drivers
32 K
Process
2 GB
per
Process
2 GB
Kernel
Space
12. User Space
Process space
1GB per process
Shared System Heap
255 MB
RAM Backed Mapfiles
256 MB
User Space
2 Gigabytes
Each process
has its own
mapping
0x00000000
0x80000000
0x40000000
Executable code and data
VM Allocations
File Back Mapfiles
All DLLs – code and data
Same mapping across all processes
Data pages are unique physical pages
Code pages are shared
RAM Backed Mapfiles
Mapped at fixed locations for
better backwards compatibility
Shared User DLLs
512 MB
R/W for OS components
Read only for user process
13. Kernel Space
Static Mapped Cached
512 MB
Static Mapped Uncached
512 MB
Kernel VM
256 MB
Kernel VM
(if supported by CPU)
256 MB
Object Store (128 MB)
CPU Specific VM
Kernel Space
2 Gigabytes
Fixed mapping
independent of
user space
Kernel XIP DLLs (128 MB)
Cached access to
physical memory
Uncached access to
physical memory
All XIP DLLs in kernel
Ram file system & ram registry
Kernel Virtual Memory
Shared by all kernel
servers and drivers
System Trap Area
0xFFFFFFFF
0x80000000
14. New OS Layout
Moving critical drivers, file system, and
graphical window manager into the kernel
Kernel version of Coredll.dll
Same APIs without the thunks
Benefit
Greatly reduces the overhead of system calls
between these components
Reduces overhead of all calls from user
space to kernel space
Increase code sharing between
base OS services
15. New OS Layout
OAL.DLL
FILESYS NETWORK
DEVICE.DLL
KERNEL.DLL
Applications
SERVICES.EXE
SHELL
Drivers
Hardware
Boot Loader
COREDLL / WINSOCK / COMMCTRL / WININET / COMMDLG
Kernel
Space
User
Space
KCOREDLL.DLL
Services
Services
Services
Services
Services
Services
Services
User Mode
Drivers
GWES
17. Security
Early Threat Modeling of the kernel
Working with MS Secure Windows Team
and penetration testers
Double checked design to tighten up
System Calls
Handles
Exception Handling
Memory Allocation
Loader
and many other components
18. Security And Robustness Features
Improved parameter validation for system calls
Per-Process Page and Handle tables
Greatly improves Process isolation
Improves code robustness
Secure Stack
System calls run on special kernel side stacks
Safe guards system calls from stack tampering
Robust Heaps
Heap control structures separated from heap data
Safe Remote Heaps for OS components
OS servers can open heaps in user process
R/W for servers, R/only for user
Performance optimization and safe from tampering
20. New Features
Large Memory Mapped File Support
Support for Large Memory Mapped Files
Up to 64 bit files
Secure Loader
Enables of control of EXE and DLL loading
Virtual Alloc Ex functions
Memory management functions for drivers
Marshalling Helper Functions
Helper functions for interprocess data marshalling
User Mode UI service
Displays UI in user mode for kernel mode drivers
Monotonic clock
Always forward going clock independent of user clock
22. Performance And Size
Improvements expected in
process switching
Same performance
Thread Switching
Memory Allocation
System Calls
Some slow down with interprocess calls
Now involves data marshalling
Size increase is less then 5%
23. Current System Calls
Application makes call
PSL jump
Kernel
Validates parameters
Maps Service into Slot 0
Possible Cache Flush
Calls into to the service
Service
Runs
Returns to Kernel
Kernel
Maps App into Slot 0
Possible cache flush
Returns to App
App Service
Kernel
24. Windows CE 6.0 Beta
System Calls Application makes call
Same PSL jump
App stays mapped during
the call
Kernel
Validates parameters
Calls into to the service
Service
Runs
Returns directly to the app
App
Service
Kernel
26. Compatibility
Binary compatibility for applications is the key goal
The general structure of the OS will be the same
Will maintain compatibility in CoreDLL
Minimize impact on Win32 APIs
Changes hidden in API libraries
Continue to shared DLL code
Well behaved SDK applications
Should work with little or no changes
Apps using undocumented techniques
Will likely have to be modified
Such as passing handles or pointers between processes
Main changes will be in how drivers access client
memory
Some drivers will migrate with little work
27. CPU Requirements
Currently the same as Windows 5.0
ARMV4I and above
MIPSII with sync instructions (ll, sc)
x86
SH4
Best performance on CPU’s with Physical
tagged caches
Virtual-tag-cached CPU have performance
penalty and limitation on virtual mappings
Same hardware as 5.0
28. Porting Incompatible Apps
Some applications will need work
Improper use of handles
nonstandard memory usage
Use of some Windows CE specific APIs
Remove old tricks and workarounds
Such as handle sharing and pointer tricks
Our verification approach
Ported Windows Mobile 5.0 to CE 6.0 Beta
Running 5.0 commercial applications
on 6.0 Beta
29. Other Porting
Drivers will require some work
System calls
Use of worker threads
Access to caller’s memory
BSP will need some work
New memory mappings
Changes to OAL to support image updates
30. Compatibility Tester
Identifies removed, deprecated, and
changed APIs
Supports both static and runtime analysis
Produces a detail report of any compatibility
issues it finds
Includes documentation and suggestions
We will release it before Windows
CE 6.0 RTM
Will allow customers to prepare
ahead of time
32. Drivers
The overall structure of the drivers
remains the same
Main changes are in how the drivers
access client memory
No SetKMode or SetProcPermissions
Two types of drivers will be supported
Kernel Mode for performance
User Mode for robustness
For full details attend –
WCE030 – Future Directions for the Windows
CE Device Driver Architecture
33. Kernel Mode Drivers
Drivers are loaded in the kernel
space by device.dll
Have full access to the kernel’s data
structures and memory
APIs used do not change
Link to a kernel version of coredll.dll
called kcoredll.dll
Thin layer for API compatibility
Directly links the services together
without thunk layer
34. User Mode Drivers
Loaded by udevices.exe
Mostly the same APIs as Kernel Mode
No access to kernel structures or memory
Kernel will marshal parameters during
system calls
Examples
Expansion buses like USB and SDIO
Keyboard and touch
35. Handling Calls
App memory already mapped correctly
Can access it without re-mapping pointers
Don’t need – these APIs are being removed
SetProcPermissions
MapPtrToProcess, UnMapPtr
Accessing callers memory
CopyIn/CopyOut
ReadProcessMemory/WriteProcessMemory
Virtual Alloc Ex APIs
Marshalling Helper Library
Provides APIs for handling user data
36. OAL Changes
OAL split from kernel
Merged into NKLoader
Enables separate updates
Overall OAL structure remains the same
Same OEM functions
Access kernel through kernel interface
Changes to the OAL initialization
Memory mappings for new memory model
38. Windows CE Is A Real-Time OS
Real time is being able to respond to an
interrupt in a bounded maximum time
Analysis by OMAC User Group shows that 95% of
real-time applications require between 0.5ms to 10
ms respond time
And tolerate 10% variations, or 50µs to 1ms jitter
Interrupt every
.5 ms to 10 ms
50µs to 1 ms Jitter
39. Real-Time Kernel
Windows CE achieves real-time by the
design of the kernel and the drivers
The majority of the kernel and driver code
can be interrupted
The uninterruptible parts are small discrete
units so interrupts can be handled quickly
The length of the largest part is
biggest latency
Windows CE 6.0 Beta kernel and drivers
are designed with the same
real-time constraints
40. Windows CE Test Results
Respond time test using the
following configuration
Samsung SMDK2410 development board
200 MHz ARM with 16x16 cache
Windows CE 5.0 with full UI
Running a WMV video
Here’s what we got –
ISR starts IST starts
Minimum 1.2 31.7
Average 3.3 67.2
Maximum 13.3 103.0
Time in microseconds (µs)
41. Windows CE 6.0 Beta Real-Time
The new kernel has the same response
times as the current kernel
May even perform slightly better because
of reduced system call overhead
Performance between app and kernel will be better
Drivers and services in services.exe will be
slightly worse
42. Call To Action
Attend the following talks
WCE032 – Windows CE Real-time Architecture
WCE030 – Future Directions for the Windows CE
Device Driver Architecture