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Re: [Qemu-devel] Fw: [Qemu-arm] [PATCH v2 0/6] Runtime pagesize computat


From: Vijay Kilari
Subject: Re: [Qemu-devel] Fw: [Qemu-arm] [PATCH v2 0/6] Runtime pagesize computation
Date: Tue, 19 Jul 2016 16:31:12 +0530

Hi Peter,

  Any update on this patch set. Is it merged?

On Wed, Jun 29, 2016 at 12:30 PM, Vijay Kilari <address@hidden> wrote:
> On Wed, Jun 29, 2016 at 12:24 PM, Kumar, Vijaya <address@hidden> wrote:
>>
>>
>>
>> ________________________________
>> From: Peter Maydell <address@hidden>
>> Sent: Tuesday, June 28, 2016 1:46 PM
>> To: qemu-arm; QEMU Developers
>> Cc: Paolo Bonzini; Kumar, Vijaya; Patch Tracking
>> Subject: Re: [Qemu-arm] [PATCH v2 0/6] Runtime pagesize computation
>>
>> On 21 June 2016 at 18:09, Peter Maydell <address@hidden> wrote:
>>> This set of patches is a development based on the ones from Vijaya:
>>> the general idea is similar but I have tried to improve the interface
>>> for defining the page size a bit.  I've also tweaked patches 2 and 3
>>> to address code review comments.
>>
>>> NB: I have only very lightly tested these and haven't attempted
>>> to measure performance at all. There is an assert() in the
>>> definition of TARGET_PAGE_BITS which is good for making sure
>>> it isn't used before it's valid but not so good for speed.
>>
>> Vijaya, are you in a position to test this patchset for
>> performance? Presumably you have a test case benchmark you're
>> looking to improve here?
>
> I have tested the patches and the test case that I was trying was
> Live migration of Idle VM on arm64 platform.
> VM migrated is with 4 VCPUS and 8GB RAM running CentOS.
>
> With page bits 10 (1K), the live migration time is 5.8 sec
>
> capabilities: xbzrle: off rdma-pin-all: off auto-converge: off
> zero-blocks: off compress: off events: off x-postcopy-ram: off
> Migration status: completed
> total time: 5857 milliseconds
> downtime: 102 milliseconds
> setup: 14 milliseconds
> transferred ram: 336081 kbytes
> throughput: 470.21 mbps
> remaining ram: 0 kbytes
> total ram: 8519872 kbytes
> duplicate: 8271539 pages
> skipped: 0 pages
> normal: 261340 pages
> normal bytes: 261340 kbytes
> dirty sync count: 3
>
> With page bits 12 (4K), live migration time is 2.9 sec
>
> capabilities: xbzrle: off rdma-pin-all: off auto-converge: off
> zero-blocks: off compress: off events: off x-postcopy-ram: off
> Migration status: completed
> total time: 2974 milliseconds
> downtime: 76 milliseconds
> setup: 5 milliseconds
> transferred ram: 301327 kbytes
> throughput: 830.30 mbps
> remaining ram: 0 kbytes
> total ram: 8519872 kbytes
> duplicate: 2062398 pages
> skipped: 0 pages
> normal: 70662 pages
> normal bytes: 282648 kbytes
> dirty sync count: 3
>
> Regards
> Vijay
>>
>> thanks
>> -- PMM



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