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Re: [Qemu-devel] [PATCH 00/16] aio_context_acquire/release pushdown, par
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 00/16] aio_context_acquire/release pushdown, part 2 |
Date: |
Fri, 20 Jan 2017 17:39:40 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 |
On 19/01/2017 18:01, Stefan Hajnoczi wrote:
>>> This is a big and somewhat risky change. Have you run any performance
>>> benchmarks?
>>
>> Not recently; I ran them a year ago and there was no measurable difference.
>
> Good, please re-run for the final version.
Done, went better than expected. :)
base
4k-1 null READ: io=6646.8MB, aggrb=226852KB/s, minb=226852KB/s,
maxb=226852KB/s, mint=30000msec, maxt=30000msec
4k-1 nvme READ: io=3086.4MB, aggrb=105342KB/s, minb=105342KB/s,
maxb=105342KB/s, mint=30001msec, maxt=30001msec
4k-32 nvme READ: io=14246MB, aggrb=486241KB/s, minb=486241KB/s,
maxb=486241KB/s, mint=30001msec, maxt=30001msec
patched:
4k-1 null READ: io=7044.5MB, aggrb=240436KB/s, minb=240436KB/s,
maxb=240436KB/s, mint=30000msec, maxt=30000msec
4k-1 nvme READ: io=3463.3MB, aggrb=118208KB/s, minb=118208KB/s,
maxb=118208KB/s, mint=30001msec, maxt=30001msec
4k-32 nvme READ: io=15217MB, aggrb=519378KB/s, minb=519378KB/s,
maxb=519378KB/s, mint=30001msec, maxt=30001msec
null is null-co://, nvme is a fast (180kIOPS on bare-metal) NVMe SSD.
So it seems to be some 5-10% faster. No idea why so I would not give too
much importance on the numbers, but at least it's not worse.
Paolo
- Re: [Qemu-devel] [PATCH 11/16] block: explicitly acquire aiocontext in callbacks that need it, (continued)
- [Qemu-devel] [PATCH 14/16] aio-posix: partially inline aio_dispatch into aio_poll, Paolo Bonzini, 2017/01/13
- Re: [Qemu-devel] [PATCH 00/16] aio_context_acquire/release pushdown, part 2, Fam Zheng, 2017/01/16
- Re: [Qemu-devel] [PATCH 00/16] aio_context_acquire/release pushdown, part 2, Stefan Hajnoczi, 2017/01/18
- Re: [Qemu-devel] [PATCH 00/16] aio_context_acquire/release pushdown, part 2, Stefan Hajnoczi, 2017/01/18