The document discusses Citrix's initiatives around open source computing and ARM scale out servers. It covers the new era of mega trends driven by mobility, smart devices, and cloud computing. Citrix is working to unify management of virtualized, physicalized, and hybrid infrastructures. Xen now supports ARM architectures and provides low overhead virtualization for ARM scale out servers, which are well suited for cloud, analytics, and other workloads. Citrix aims to deliver a unified experience across all device types, workloads, and infrastructure resources.

1. Citrix Open Source Computing and ARM Scale Out servers
ARM TechCon 2014, Santa Clara
Ahmed Sallam, VP of Product Strategy and CTO
Hardware, Security, IP and Emerging Solutions
© 2014 Citrix. Confidential.

2. Agenda
• The New Era of Mega Trends
• ARM Scale Out Servers
• Citrix Open Source Initiatives
• Xen on ARM
© 2014 Citrix. Confidential.

3. © 2014 Citrix. Confidential.
The Era of Mega Trends
Changing work styles and people’s personal lives
• Humanization of computing: perceptual, wearables, cognitive, immersive, affective..
• Mobility, consumerization, BYOD and smart devices everywhere
• Converged and fabric based infrastructure
• Everything on a chip: compute, graphic, vision sensors, hearing sensors, etc.
• Hardware rooted security: CPU, GPU, Secure Elements, TPM, etc.

4. The Connected World or the Internet of Everything
2020: 50B connected devices
Fusion: 2025-2030 with 1 trillion devices
One device every 6 sq ft of land
© 2014 Citrix. Confidential.

5. Things getting smaller, smarter and connected
Security and safety
Standards and interoperability
User interfaces and social norms
© 2014 Citrix. Confidential.

6. The Software-defined cloud driven smart world
Software defined servers, networks, storage and workplace
Cloud is the central point of control
Scale-Out Servers
© 2014 Citrix. Confidential.
Contextual
Infinite compute
Never touch devices
Management at scale
End to End Security
Predictive Analytics
Green Computing
Big data

7. World of open computing
➔ SoC: Unified CPU, GPU, Memory, DSP and I/O architecture.
➔ Everything as a service: IT, software and hardware.
➔ It’s no longer about OS, but more about apps and user experience.
➔ A true moment of OPEN Computing: OPEN Architecture, Standards and Source.
➔ With such grand shifts in technology, new architectures layers are invented and others vanish.
➔ All good for Citrix, we’ve been doing app remoting, management and security for 25 years.
◆ Instant, secure access to apps and desktops from any device over any network.
© 2014 Citrix. Confidential.

8. ARM is at the center of the new era
of hardware innovation and
disruption.
http://www.next100billionchips.com/
© 2014 Citrix. Confidential.

9. The new evolving fanless ARM server ecosystem
From scale-out to multi-core high performance servers
© 2014 Citrix. Confidential.
Cavium ThunderX:
up to 48 cores, 2.5 Ghz, 28nm
HP Scale-Out Moonshot:
up to 45 cartridges
ARM SoC
AppliedMicro X-Gene
Cartridge server

10. Physicalization and Scale Out Computing
● Small size with big innovation
● High Density, energy efficient and lower cost
● Quick scaling with less complexities.
● Engineered and integrated for workload-specific performance.
● Cartridges for web serving, hosted desktops, video transcoding,
application delivery, real-time data processing,...
● New option for BigData and Cloud
© 2014 Citrix. Confidential.

11. Benefits of ARM scale out servers
● Strong, diverse extensible open ecosystem
● Server cartridges optimized per workloads
● Hardware rooted security via TrustZone
● Hardware assisted virtualization in ARMv7 and ARMv8
● Linaro delivering enterprise open software stacks: LAMP, Java, ….
● Open standards to avoid fragmentation: SBSA, SBBA, OCP
© 2014 Citrix. Confidential.

12. Learning from AWS
It’s not just about big servers -> Scale Out Servers
© 2014 Citrix. Confidential.
Over 50%:
2 cores
7.5 GB RAM
or smaller

13. ARM and new era of Build Your Own Hardware (BYOH)
© 2014 Citrix. Confidential.

14. Workload agility
© 2014 Citrix. Confidential.
Faster provisioning
Why virtualize?
Abstraction and
portability
Software-defined I/O
Ease of
software
management
Out-of-band
Introspection and
monitoring
Trusted Computing
Base
Minimal hypervisor
overhead
Consolidation
Increase uptime
Hardware assisted
Compute mobility
Efficient resource
utilization

15. Native hardware
speed Avoid complexity
Why physicalize not virtualize?
© 2014 Citrix. Confidential.
Compliance and
regulation
Ease of hardware
management
Hard real time
workloads
Hardware
isolation
Increased bill of
materials

16. © 2014 Citrix. Confidential.
Hardware
hypervisor
many OSes on a single machine
What to virtualize?
overhead ~2%
Strong isolation
Strong security
Linux user space environment (POSIX)
Docker (LXC)
Many Linux appliances on a single OS
Easy to use
App-driven
Less secure
Hardware multi-tenancy
and virtualization
OS multi-tenancy
via app-level
containers

17. Workload
Workload Virtualization
© 2014 Citrix. Confidential.
Orchestration (e.g. CloudStack)
Workload
ARM server
Workload
ARM server
Physicalization
Workload
Workload
Workload
Containers
ARM server
Containerization
Mirage App
OSv App
Workload
ARM server
Unikernels
Mirage App
ARM server
Mixed
Workload
Various architectural options

18. Citrix vision
© 2014 Citrix. Confidential.
It’s one IT infrastructure
whether virtualized, physicalized or hybrid
Unified management, orchestration and security across
hardware, operating systems, applications and data.

19. © 2014 Citrix. Confidential.

20. Citrix Open Computing Supported Projects
© 2014 Citrix. Confidential.
Citrix donated CloudStack to the Apache Software
Foundation in April 2012
CloudStack graduated from Apache Incubator and
became a top level project in March 2013
The leading open source enterprise server virtualization
platform, powered by the Xen hypervisor
Open Sourced in June 2013
A Linux Foundation Collaborative Project since April
2013
ARM joined Xen Project Advisory Board since December
2013

21. © 2014 Citrix. Confidential.
Xen is a type 1 hypervisor
with drivers running in a separate domain

22. Console
VM0 (or Dom0)
Dom0 Kernel
Drivers
© 2014 Citrix. Confidential.
VM1
Applications
Guest OS
VM2 VMn
Applications
Guest OS
Applications
Guest OS
I/O Memory CPUs HW
Toolstack
bac
k PV front
Scheduler MMU Timers Interrupt
Config s

23. Xen on ARM Design Goals
Avoid x86 “baggage”
© 2014 Citrix. Confidential.
No Emulation
Make optimum use of the ARM hardware
Supports 32 and 64 bit
Small code base

24. Maximum use of ARM Virtualization Features
ARM SOC
Device Tree describes …
© 2014 Citrix. Confidential.
GIC
v2/v3
Generic
Timers
2
stageM
MU
I/O
ARM Architecture Features for Virtualization
User mode: EL0
Kernel mode: EL1
Hypervisor mode: EL2
HyperCalls (HVC)

25. ARM Architecture Features ARM SOC for Virtualization
Device Tree describes …
© 2014 Citrix. Confidential.
Any Xen Guest VM (including Dom0)
User mode: EL0
Maximum use of ARM Virtualization Features
Kernel mode: EL1
GICv2/
v3
Generic
Timers
2
stageM
MU
I/O
Hypervisor mode: EL2
User Space
HyperCalls (HVC)
Xen Hypervisor
Kernel
Dom0
only

26. Other advantages
One kind of guest (no PV vs. HVM)
Xen is easy to port to new ARM SOCs
OSes are easy to port to Xen on ARM
© 2014 Citrix. Confidential.

27. Xen has very low virtualization overhead
y axes show the virtualization overhead:
A lower percentage means less overhead and therefore better performance
© 2014 Citrix. Confidential.

28. © 2014 Citrix. Confidential.
Xen support for
ARM64 upstream
in Linux 3.11
Xen support for
ARM upstream
in Linux 3.7
11/11 08/12 09/12
11/12 03/13 07/13
Xen running on
real ARM
hardware
First Xen on ARM talk
at Xen Summit 2012
Xen 64-bit
on ARM64
01/13
Citrix announces
that will be joining
Linaro
Xen 4.3 released
with ARM and
ARM64 support
Part-time Xen ARM
hacking starts
Xen 4.4 release
06/13 03/14

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30. © 2014 Citrix. Confidential.
One
last
thing!

31. Takeaways
© 2014 Citrix. Confidential.
Scale out
computing
fits Cloud
New era
of mega
trends
Software
Defined
Smart
Connected
World
Cloud
analytics
and Big
data
Unify
V12n &
P13n
Xen now
runs on
ARM

32. © 2014 Citrix. Confidential.
WORK BETTER. LIVE BETTER.