Messages in this thread | | | Date | Mon, 18 Jun 2012 17:39:10 +0800 | From | Asias He <> | Subject | Re: [PATCH v2 0/3] Improve virtio-blk performance |
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On 06/18/2012 05:14 PM, Stefan Hajnoczi wrote: > On Mon, Jun 18, 2012 at 7:53 AM, Asias He <asias@redhat.com> wrote: >> Fio test shows it gives, 28%, 24%, 21%, 16% IOPS boost and 32%, 17%, 21%, 16% >> latency improvement for sequential read/write, random read/write respectively. > > Sounds great. What storage configuration did you use (single spinning > disk, SSD, storage array) and are these numbers for parallel I/O or > sequential I/O?
I used ramdisk as the backend storage.
> What changed since Minchan worked on this? I remember he wasn't > satisfied that this was a clear win. Your numbers are strong so > either you fixed something important or you are looking at different > benchmark configurations.
I am using kvm tool instead qemu. He wasn't satisfied the poor sequential performance. I removed the plug and unplug operation and bio completion batching. You can grab Michan's patch and make a diff to see the details.
Here is the fio's config file.
[global] exec_prerun="echo 3 > /proc/sys/vm/drop_caches" group_reporting norandommap ioscheduler=noop thread bs=512 size=4MB direct=1 filename=/dev/vdb numjobs=256 ioengine=aio iodepth=64 loops=3
[seq-read] stonewall rw=read
[seq-write] stonewall rw=write
[rnd-read] stonewall rw=randread
[rnd-write] stonewall rw=randwrite
-- Asias
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