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Re: Re: [XenARM] Which ARM architecture is plannet to be supported.
I presume that Xen ARM hypervisor has shown the best performance compared with
other solutions as you mentioned.
Please find the benchmark information of my presentation,
at the Xen Summit Asia 2009.
One of major performance issues was caused by TLB cache handling, as ARM v5
core has got virtual cache.
Presumably, one of good applications ussing hypervisor is security enhancement
I think that you can find other applications using Xen ARM from my Xen Summit
Presentation below or also from an ACM MobiCom 09 paper.
FYI, the latest presentation when I gave August 2011 at Xen Summit North
America may give an update about the status of Xen ARM in terms of ARM CPU
support and OS support
and evolution of Xen ARM in terms of architecture and performance also will be
found at my presentations since Xen Summit at IBM in 2007.
On the other hand, Cortex A15 is mentioned as a future plan of the Xen ARM
project. where Cortex A15 is based on ARM v7.
Regarding Xen x86, it can use para-virtualized Linux and non-virtualized OS as
some Intel CPU already supports virtualization extension
such as sub-ring 0 to run hypervisor.
I have worked for hosting of Xen Summit Asia 2011 November 2 and 3 and if you
are interested in more latest information from ARM and others, please attend
the Summit as speakers from ARM, other leading companies as for hypervisor, CPU
and cloud computing will give talks.
I hope this answers your questions.
Sang-bum Suh, PhD
Vice President, S/W Platform Lab
S/W Platform Team, DMC Research Center
------- Original Message -------
Sender : Jean-Christophe DUBOIS<jcd@xxxxxxxxxxxxxxx>
Date : 2011-09-27 06:56 (GMT+09:00)
Title : Re: [XenARM] Which ARM architecture is plannet to be supported.
Thanks for your answer.
If I read you correctly, Xen on ARM for ARMv5 and ARMv6 does not seem good
performance wise. Do you have some benchmarks on this topic (Linux bare metal
compared to Linux on top of Xen)? Obviously the lack of virtualization
features on these processors mandates the use of a para-virtualized low level
API that may certainly have its drawbacks.
Now excuse my ignorance but it seems other hypervisors out there (the L4
familly for example) have acceptable performance hit when it comes to running
Linux on ARM. In addition you may want to consider that for certain type of
application the use of an hypervisor may not be driven only by performance
reasons. Hypervisors are bringing other types of benefits/services. An there
are a lot of devices out there which are not ARMv7 based and that would be too
bad to let them Xen-orphaned.
Beside Xen still supports generic x86 (32 bits) architecture which for the
most part has no hardware support for virtualization and therefore also need
to take the para-virtualization way with the same kind of performance hit I
guess. Is it real worse on ARM?
As for cortex A15 it is "just" another ARMv7 processor with added
virtualization features so it certainly make sense to add support for it after
the CortexA8/A9 is done. But there will not be a lot of people out there able
to help as the access to such hardware will be scarce at first.
On Monday 26 September 2011 04:02:01 you wrote:
> Xen ARM source code based on ARM v7 with multicore support has recently
> been changed so that CPU architecture independent code of x86 based Xen
> mainline will be shared I have a plan to support the future Cortex A15
> virtualization extension.
> On the other hand, I have released Xen ARM hypervisor source code since
> 2008, which includes ARM v5, v6 and the para-virtualized ARM Linux kernel
> patch. These source code can be found at the Xen ARM wiki of Xen.org.
> Considering performance issues in terms of CPU overhead, context switching
> overhead due to cache architecture and CPU architecture such as multicore
> support issues,
> I think that it is better for ARM v5 and v6 Xen ARM hypervisor source code
> to not be merged with the Xen mainline.
> I suggest to use the archieved Xen ARM hypervisor for ARM v5 and v6 at the
> Xen ARM wiki.
> Thank you,
> Sang-bum Suh, PhD
> Vice President, S/W Platform Lab
> S/W Platform Team, DMC Research Center
> Samsung Electronics
> email: sbuk.suh@xxxxxxxxxxx
> ------- Original Message -------
> Sender : Jean-Christophe DUBOIS<jcd@xxxxxxxxxxxxxxx>
> Date : 2011-09-24 05:29 (GMT+09:00)
> Title : [XenARM] Which ARM architecture is plannet to be supported.
> Just out of curiosity is this project only planning on supporting the ARMv7
> architecture or are ARMv5 and v6 still part of the plan?
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