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

[Vijay Kilari]

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