The Arm architecture provides a set of guidelines that any software should abide by when accessing the memory with MMU off and update page-tables. Failing to do so may result in getting TLB conflicts or breaking coherency.
In a previous talk ("Keeping coherency on Arm"), we focused on updating safely the stage-2 (aka P2M) page-tables. This talk will focus on the boot code and Xen memory management.
During this session, we will introduce some of the guidelines and when they should be used. We will also discuss how Xen boot sequence needs to be reworked to avoid breaking the guidelines.
A simple 5 stage CPU design supporting addition, multiplication, load word and store word. The design is based on Cadence Virtuoso with 400nm technology.
A simple 5 stage CPU design supporting addition, multiplication, load word and store word. The design is based on Cadence Virtuoso with 400nm technology.
The ARM architecture strongly recommends to use a break-before-make when changing translation table entries whenever certain conditions are met. Failing to do so may result in getting TLB conflicts or breaking the coherency.
During this session, we will introduce break-before-make and when the code handling page tables should use it. We will also discuss the modifications required in Xen to avoid breaking the coherency.
XPDDS18: The Art of Virtualizing Cache Maintenance - Julien Grall, ArmThe Linux Foundation
The Arm architecture allows for a wide variety of cache configurations, levels and features. This enables building systems that will optimally fit power/area budgets set for the target application.
A consequence of this is that architecturally compliant software has to cater for a much wider range of behaviors than on other architectures. While most software uses cache instructions that don't need special treatment in a virtualized environment, some will want to directly manage a given cache using set/way instructions and will introduce challenges for the hypervisor to handle them.
This talk will give an overview of how caches behave in the Arm architecture, especially in the context of virtualization. It will then describe the problem of using set/way instructions in a virtualized environment. We will also discuss the modifications required in Xen to handle those instructions.
MySQL Cluster Local Checkpoint (LCP) evolution in 7.6 (2019)Frazer Clement
Description of the Local Checkpoint (LCP) feature in MySQL Cluster, and how it has evolved over releases up to and including MySQL Cluster 7.6, which introduces the novel 'Partial LCP' implementation, allowing reduced disk space consumption for checkpoints and redo logs.
When first designing industrial automation projects, it’s easy to make some common mistakes that can make integrating harder than it needs to be and cause headaches down the road. The best way to set yourself up for success is to recognize best practices as soon as possible. Not only does this save time on rework and future development, but it also allows for more predictability, better organization, and increased functionality.
Mainframe Fine Tuning - Fabio Massimo OttavianiNRB
Mainframe cost is heavily dependent on the real CPU load through the IBM mechanism for charging Software by the 4 hours rolling average. By precisely monitoring various loads (as detecting rapidly abnormal CPU peaks, optimizing Disk I/O and using new features as Large pages), EPV provides a toolset to reduce the CPU load (and hence the IBM Software charging) while better using it.
Linux Memory Management with CMA (Contiguous Memory Allocator)Pankaj Suryawanshi
Fundamentals of Linux Memory Management and CMA (Contiguous Memory Allocator) In Linux.
Virtual Memory, Physical Memory, Swap Space, DMA, IOMMU, Paging, Segmentation, TLB, Hugepages, Ion google memory manager
z/OS V2R2 Communications Server OverviewzOSCommserver
This presentation provides an overview of features in the upcoming z/OS V2R2 Communications Server. Features to be discussed include:
- Improved scalability with 64-bit support for the TCP/IP stack
- Shared Memory Communications over RDMA (SMC-R) adapter virtualization
- Security improvements such as AT-TLS and FTP support for TLS session reuse
- The ability to configure the TCP/IP stack via the IBM Configuration Assistant for z/OSMF
- Support for CICS transaction tracking
- TCP/IP autonomics enhancements
… and many more features!
Amazon Aurora Storage Demystified: How It All Works (DAT363) - AWS re:Invent ...Amazon Web Services
Amazon Aurora is a high performance, highly scalable database service with MySQL- and PostgreSQL-compatibility. One of its key components is an innovative storage system that is optimized for database workloads and specifically designed to take advantage of modern cloud technology. Hear from the team that built Amazon Aurora's storage system on how the system is designed, how it works, and what you need to know to get the most out of it.
Management and Automation of MongoDB Clusters - SlidesSeveralnines
Use MongoDB at Any Scale
As you scale, one of the challenges is optimizing your clusters and mitigating operational risk. Proper preparation can result in significant savings and reduced downtime.
This session covers:
* Deployment of dev/test/production environments across private data centers or public clouds
* What to monitor in production environments
* Management automation with ClusterControl from Severalnines
* How ClusterControl works with TokuMX
The session will give you the tools to more effectively manage your cluster, immediately. The presentation will include code samples and a live Q&A session.
This webinar is being delivered jointly by Severalnines & Tokutek. Severalnines provides automation and management tools to reduce the complexity of working with highly available database clusters. Tokutek provides high-performance and scalability for MongoDB, MySQL and MariaDB.
Static partitioning is used to split an embedded system into multiple domains, each of them having access only to a portion of the hardware on the SoC. It is key to enable mixed-criticality scenarios, where a critical application, often based on a small RTOS, runs alongside a larger non-critical app, typically based on Linux. The two domains cannot interfere with each other.
This talk will explain how to use Xen for static partitioning. It will introduce dom0-less, a new Xen feature written for the purpose. Dom0-less allows multiple VMs to start at boot time directly from the Xen hypervisor, decreasing boot times drastically. It makes it very easy to partition the system without virtualization overhead. Dom0 becomes unnecessary.
This presentation will go into details on how to setup a Xen dom0-less system. It will show configuration examples and explain device assignment. The talk will discuss its implications for latency-sensitive and safety-critical environments.
XPDDS19: How TrenchBoot is Enabling Measured Launch for Open-Source Platform ...The Linux Foundation
TrenchBoot is a cross-community OSS integration project for hardware-rooted, late launch integrity of open and proprietary systems. It provides a general purpose, open-source DRTM kernel for measured system launch and attestation of device integrity to trust-centric access infrastructure. TrenchBoot closes the UEFI Measurement Gap and reduces the need to trust system firmware. This talk will introduce TrenchBoot architecture and a recent collaboration with Oracle to launch the Linux kernel directly with Intel TXT or AMD SVM Secure Launch. It will propose mechanisms for integrating the Xen hypervisor into a TrenchBoot system launch. DRTM-enabled capabilities for client, server and embedded platforms will be presented for consideration by the Xen community.
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The ARM architecture strongly recommends to use a break-before-make when changing translation table entries whenever certain conditions are met. Failing to do so may result in getting TLB conflicts or breaking the coherency.
During this session, we will introduce break-before-make and when the code handling page tables should use it. We will also discuss the modifications required in Xen to avoid breaking the coherency.
XPDDS18: The Art of Virtualizing Cache Maintenance - Julien Grall, ArmThe Linux Foundation
The Arm architecture allows for a wide variety of cache configurations, levels and features. This enables building systems that will optimally fit power/area budgets set for the target application.
A consequence of this is that architecturally compliant software has to cater for a much wider range of behaviors than on other architectures. While most software uses cache instructions that don't need special treatment in a virtualized environment, some will want to directly manage a given cache using set/way instructions and will introduce challenges for the hypervisor to handle them.
This talk will give an overview of how caches behave in the Arm architecture, especially in the context of virtualization. It will then describe the problem of using set/way instructions in a virtualized environment. We will also discuss the modifications required in Xen to handle those instructions.
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When first designing industrial automation projects, it’s easy to make some common mistakes that can make integrating harder than it needs to be and cause headaches down the road. The best way to set yourself up for success is to recognize best practices as soon as possible. Not only does this save time on rework and future development, but it also allows for more predictability, better organization, and increased functionality.
Mainframe Fine Tuning - Fabio Massimo OttavianiNRB
Mainframe cost is heavily dependent on the real CPU load through the IBM mechanism for charging Software by the 4 hours rolling average. By precisely monitoring various loads (as detecting rapidly abnormal CPU peaks, optimizing Disk I/O and using new features as Large pages), EPV provides a toolset to reduce the CPU load (and hence the IBM Software charging) while better using it.
Linux Memory Management with CMA (Contiguous Memory Allocator)Pankaj Suryawanshi
Fundamentals of Linux Memory Management and CMA (Contiguous Memory Allocator) In Linux.
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z/OS V2R2 Communications Server OverviewzOSCommserver
This presentation provides an overview of features in the upcoming z/OS V2R2 Communications Server. Features to be discussed include:
- Improved scalability with 64-bit support for the TCP/IP stack
- Shared Memory Communications over RDMA (SMC-R) adapter virtualization
- Security improvements such as AT-TLS and FTP support for TLS session reuse
- The ability to configure the TCP/IP stack via the IBM Configuration Assistant for z/OSMF
- Support for CICS transaction tracking
- TCP/IP autonomics enhancements
… and many more features!
Amazon Aurora Storage Demystified: How It All Works (DAT363) - AWS re:Invent ...Amazon Web Services
Amazon Aurora is a high performance, highly scalable database service with MySQL- and PostgreSQL-compatibility. One of its key components is an innovative storage system that is optimized for database workloads and specifically designed to take advantage of modern cloud technology. Hear from the team that built Amazon Aurora's storage system on how the system is designed, how it works, and what you need to know to get the most out of it.
Management and Automation of MongoDB Clusters - SlidesSeveralnines
Use MongoDB at Any Scale
As you scale, one of the challenges is optimizing your clusters and mitigating operational risk. Proper preparation can result in significant savings and reduced downtime.
This session covers:
* Deployment of dev/test/production environments across private data centers or public clouds
* What to monitor in production environments
* Management automation with ClusterControl from Severalnines
* How ClusterControl works with TokuMX
The session will give you the tools to more effectively manage your cluster, immediately. The presentation will include code samples and a live Q&A session.
This webinar is being delivered jointly by Severalnines & Tokutek. Severalnines provides automation and management tools to reduce the complexity of working with highly available database clusters. Tokutek provides high-performance and scalability for MongoDB, MySQL and MariaDB.
Static partitioning is used to split an embedded system into multiple domains, each of them having access only to a portion of the hardware on the SoC. It is key to enable mixed-criticality scenarios, where a critical application, often based on a small RTOS, runs alongside a larger non-critical app, typically based on Linux. The two domains cannot interfere with each other.
This talk will explain how to use Xen for static partitioning. It will introduce dom0-less, a new Xen feature written for the purpose. Dom0-less allows multiple VMs to start at boot time directly from the Xen hypervisor, decreasing boot times drastically. It makes it very easy to partition the system without virtualization overhead. Dom0 becomes unnecessary.
This presentation will go into details on how to setup a Xen dom0-less system. It will show configuration examples and explain device assignment. The talk will discuss its implications for latency-sensitive and safety-critical environments.
XPDDS19: How TrenchBoot is Enabling Measured Launch for Open-Source Platform ...The Linux Foundation
TrenchBoot is a cross-community OSS integration project for hardware-rooted, late launch integrity of open and proprietary systems. It provides a general purpose, open-source DRTM kernel for measured system launch and attestation of device integrity to trust-centric access infrastructure. TrenchBoot closes the UEFI Measurement Gap and reduces the need to trust system firmware. This talk will introduce TrenchBoot architecture and a recent collaboration with Oracle to launch the Linux kernel directly with Intel TXT or AMD SVM Secure Launch. It will propose mechanisms for integrating the Xen hypervisor into a TrenchBoot system launch. DRTM-enabled capabilities for client, server and embedded platforms will be presented for consideration by the Xen community.
XPDDS19 Keynote: Xen in Automotive - Artem Mygaiev, Director, Technology Solu...The Linux Foundation
Artem will briefly cover what has been done since the first talk on Xen in Automotive domain back in 2013, what is going on now and what is still missing for broad adaptation of Xen in vehicles. The following topics will be covered:
Embedded/automotive features of Xen
Collaboration with AGL and GENIVI organizations for standardization
Efforts on Functional Safety compliance
Artem will also go over typical automotive use scenarios for Xen which may not be the same as generic computing use of hypervisor.
XPDDS19 Keynote: Xen Project Weather Report 2019 - Lars Kurth, Director of Op...The Linux Foundation
In this keynote talk, we will give an overview of the state of the Xen Project, trends that impact the project, see whether challenges that surfaced last year have been addressed and how we did it, and highlight new challenges and solutions for the coming year.
In recent years unikernels have shown immense performance potential (e.g., boot times of only a few ms, image sizes of only hundreds of KBs).The fundamental drawback of unikernels is that they require that applications be manually ported to the underlying minimalistic OS, needing both expert work and often considerable amount of time.
The Unikraft project provides a unikernel code base and build system that significantly simplifies the building of unikernels. In addition to support for a number CPU architectures, languages and frameworks, Unikraft provides debugging and tracing features that are generally sorely missing from unikernel projects. In this talk we will talk about these features, show a set of preliminary performance numbers, and provide a roadmap for the project's future.
XPDDS19 Keynote: Secret-free Hypervisor: Now and Future - Wei Liu, Software E...The Linux Foundation
The idea of making Xen secret-free has been floating since Spectre and Meltdown came into light. In this talk we will discuss what is being done and what needs to be done next.
XPDDS19 Keynote: Xen Dom0-less - Stefano Stabellini, Principal Engineer, XilinxThe Linux Foundation
This talk will introduce Dom0-less: a new way of using Xen to build mixed-criticality solutions. Dom0-less is a Xen feature that adds a novel approach to static partitioning based on virtualization. It allows multiple domains to start at boot time directly from the Xen hypervisor, decreasing boot times dramatically. Xen userspace tools, such as xl and libvirt, become optional.
Dom0-less extends the existing device tree based Xen boot protocol to cover information required by additional domains. Binaries, such as kernels and ramdisks, are loaded by the bootloader (u-boot) and advertised to Xen via new device tree bindings.
The audience will learn how to use Dom0-less to partition the system. Uboot and device tree configuration details will be explained to enable the audience to get the most out of this feature. The talk will include a status update and details on future plans.
XPDDS19 Keynote: Patch Review for Non-maintainers - George Dunlap, Citrix Sys...The Linux Foundation
As the number of contributions grow, reviewer bandwidth becomes a bottleneck; and maintainers are always asking for more help. However, ultimately maintainers must at least Ack every patch that goes in; so if you're not a maintainer, how can you contribute? Why should anyone care about your opinion?
This talk will try to lay out some advice and guidelines for non-maintainers, for how they can do code review in a way which will effectively reduce the load on maintainers when they do come to review a patch.
This talk is a follow-up to our Summit 2017 presentation in which we covered our plans for Intel VMFUNC and #VE, as well as related use-cases. This year, we will provide a report on what we have accomplished in Xen 4.12, and what remains to be addressed. We will also give a brief status update of VMI on AMD hardware. The session will end with some real-world numbers of the Hypervisor Introspection solution running on Citrix Hypervisor 8.0 with #VE enabled.
OSSJP/ALS19: The Road to Safety Certification: Overcoming Community Challeng...The Linux Foundation
Safety certification is one of the essential requirements for software to be used in highly regulated industries. Besides technical and compliance issues (such as ISO 26262 vs IEC 611508) transitioning an existing project to become more easily safety certifiable requires significant changes to development practices within an open source project.
In this session, we will lay out some challenges of making safety certification achievable in open source and the Xen Project. We will outline the process the Xen Project has followed thus far and highlight lessons learned along the way. The talk will primarily focus on necessary process, tooling changes and community challenges that can prevent progress. We will be offering an in-depth review of how Xen Project is approaching this challenging goal and try to derive lessons for other projects and contributors.
OSSJP/ALS19: The Road to Safety Certification: How the Xen Project is Making...The Linux Foundation
Safety certification is one of the essential requirements for software to be used in highly regulated industries. The Xen Project, a secure and stable hypervisor that is used in many different markets, has been exploring the feasibility of building safety certified products on top of Xen for a year, looking at key aspects of its code base and development practices.
In this session, we will lay out the motivation and challenges of making safety certification achievable in open source and the Xen Project. We will outline the process the project has followed thus far and highlight lessons learned along the way. The talk will cover technical enablers, necessary process and tooling changes and community challenges offering an in-depth review of how Xen Project is approaching this exciting and and challenging goal.
XPDDS19: Speculative Sidechannels and Mitigations - Andrew Cooper, CitrixThe Linux Foundation
2018 saw fundamental shifts in security boundaries which were previously taken for granted. A lot of work has been done in the past 2 years, and largely in secret under embargo, but there is plenty more work to be done to strengthen the existing mitigations and to try to recover some performance without reopening security holes.
This talk will look at speculative execution sidechannels, the work which has already been done to mitigate the security holes, and future work which hopes to bring some improvements.
XPDDS19: QEMU PV Backend 'qdevification'... What Does it Mean? - Paul Durrant...The Linux Foundation
For many years the QEMU codebase has contained PV backends for Xen guests, giving them paravirtual access to storage, network, keyboard, mouse, etc. however these backends have not been configurable as QEMU devices as their implementation did not fully adhere to the QEMU Object Model (QOM).
Particularly the PV storage backend not using proper QOM devices, or qdevs, meant that the QEMU block layer needed to maintain legacy code that was cluttering up the source. This was causing push-back from the maintainers who did not want to accept any patches relating to that Xen backend until it was 'qdevified'.
In this talk, I'll explain the modifications I made to QEMU to achieve 'qdevification' of the PV storage backend, how compatibility with the libxl toolstack was maintained, and what the next steps in both QEMU and libxl development should be.
XPDDS19: Status of PCI Emulation in Xen - Roger Pau Monné, Citrix Systems R&DThe Linux Foundation
PCI is a local computer bus for attaching hardware devices in a computer, and is the main peripheral bus on modern x86 systems. As such, having a proper way to emulate it is crucial for Xen to be able to expose both fully emulated devices or passthrough devices to guests.
This talk will focus on the current status of PCI emulation in Xen, how and where it is used, what are its main limitations and future plans to improve it in order to be more robust and modular.
XPDDS19: [ARM] OP-TEE Mediator in Xen - Volodymyr Babchuk, EPAM SystemsThe Linux Foundation
Volodymyr will speak about TEE mediators. This is a new feature in Xen which allows multiple virtual machines to interact with Trusted Execution Environment available on platform. He developed mediator for one of TEEs, namely OP-TEE.
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XPDDS19: Bringing Xen to the Masses: The Story of Building a Community-driven...The Linux Foundation
Xen is a very powerful hypervisor with a talented and diverse developers community. Despite the fact it's almost everywhere (from the Cloud to the embedded world), it can be difficult to set up and manage as a system administrator. General purpose distros have Xen packages, but that's just a start in your Xen journey: you need some tooling and knowledge to have a working and scalable platform.
XCP-ng was built to overcome those issues: by bringing Xen to the masses with a fully turnkey distro with Xen as its core. It's the logical sequel to the XCP project, with a community focus from the start. We'll see how it happened, what we did, and what's next. Finally, we'll see the impact of XCP-ng on the Xen Project.
XPDDS19: Will Robots Automate Your Job Away? Streamlining Xen Project Contrib...The Linux Foundation
Doug has long advocated for more CI/CD (Continuous Integration / Continuous Delivery) processes to be adopted by the Xen Project from the use of Travis CI and now GitLab CI. This talk aims to propose ideas for building upon the existing process and transforming the development process to provide users a higher quality with each release by the Xen Project.
XPDDS19: Client Virtualization Toolstack in Go - Nick Rosbrook & Brendan Kerr...The Linux Foundation
High level toolstacks for server and cloud virtualization are very mature with large communities using and supporting them. Client virtualization is a much more niche community with unique requirements when compared to those found in the server space. In this talk, we’ll introduce a client virtualization toolstack for Xen (redctl) that we are using in Redfield, a new open-source client virtualization distribution that builds upon the work done by the greater virtualization and Linux communities. We will present a case for maturing libxl’s Go bindings and discuss what advantages Go has to offer for high level toolstacks, including in the server space.
Today Xen is scheduling guest virtual cpus on all available physical cpus independently from each other. Recent security issues on modern processors (e.g. L1TF) require to turn off hyperthreading for best security in order to avoid leaking information from one hyperthread to the other. One way to avoid having to turn off hyperthreading is to only ever schedule virtual cpus of the same guest on one physical core at the same time. This is called core scheduling.
This presentation shows results from the effort to implement core scheduling in the Xen hypervisor. The basic modifications in Xen are presented and performance numbers with core scheduling active are shown.
XPDDS19: Implementing AMD MxGPU - Jonathan Farrell, Assured Information SecurityThe Linux Foundation
The use of Virtual GPUs (vGPUs) has widely grown in server farms to give Virtual Machines (VMs) dedicated graphics. Software rendering with virtual CPUs can only take us so far and even with Intel-GVT, which uses integrated graphics, there isn't enough power to do the fun stuff. In this presentation, Jon Farrell will be talking about the process of implementing AMD MxGPU on Xen, challenges that he encountered while doing it, and discussing performance metrics of bare metal and vGPU VM on popular benchmarks like 3D Mark* and The Witcher 3. To wrap up his presentation, Jon will share his thoughts about future research and where this technology can take us.
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Experience our free, in-depth three-part Tendenci Platform Corporate Membership Management workshop series! In Session 1 on May 14th, 2024, we began with an Introduction and Setup, mastering the configuration of your Corporate Membership Module settings to establish membership types, applications, and more. Then, on May 16th, 2024, in Session 2, we focused on binding individual members to a Corporate Membership and Corporate Reps, teaching you how to add individual members and assign Corporate Representatives to manage dues, renewals, and associated members. Finally, on May 28th, 2024, in Session 3, we covered questions and concerns, addressing any queries or issues you may have.
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Key principles of platformless, including API-first, cloud-native middleware, platform engineering, and developer experience.
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In software engineering, the right architecture is essential for robust, scalable platforms. Wix has undergone a pivotal shift from event sourcing to a CRUD-based model for its microservices. This talk will chart the course of this pivotal journey.
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One app for all industries – a Visitor Management System that works for any organisation.
Stress-free Sign-up
Visitor is registered and checked-in by the Receptionist
Host gets a notification, where they opt to Approve the meeting
Host notifies the Receptionist of the end of the meeting
Visitor is checked-out by the Receptionist
Host enters notes and remarks of the meeting
Customizable Components
Scheduling Meetings – Host can invite visitors for meetings and also approve, reject and reschedule meetings
Single/Bulk invites – Invitations can be sent individually to a visitor or collectively to many visitors
VIP Visitors – Additional security of data for VIP visitors to avoid misuse of information
Courier Management – Keeps a check on deliveries like commodities being delivered in and out of establishments
Alerts & Notifications – Get notified on SMS, email, and application
Parking Management – Manage availability of parking space
Individual log-in – Every user has their own log-in id
Visitor/Meeting Analytics – Evaluate notes and remarks of the meeting stored in the system
Visitor Management System is a secure and user friendly database manager that records, filters, tracks the visitors to your organization.
"Secure Your Premises with VizMan (VMS) – Get It Now"
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