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Re: virtiofs vs 9p performance
From: |
Christian Schoenebeck |
Subject: |
Re: virtiofs vs 9p performance |
Date: |
Fri, 25 Sep 2020 10:06:41 +0200 |
On Freitag, 25. September 2020 00:10:23 CEST Vivek Goyal wrote:
> In my testing, with cache=none, virtiofs performed better than 9p in
> all the fio jobs I was running. For the case of cache=auto for virtiofs
> (with xattr enabled), 9p performed better in certain write workloads. I
> have identified root cause of that problem and working on
> HANDLE_KILLPRIV_V2 patches to improve WRITE performance of virtiofs
> with cache=auto and xattr enabled.
Please note, when it comes to performance aspects, you should set a reasonable
high value for 'msize' on 9p client side:
https://wiki.qemu.org/Documentation/9psetup#msize
I'm also working on performance optimizations for 9p BTW. There is plenty of
headroom to put it mildly. For QEMU 5.2 I started by addressing readdir
requests:
https://wiki.qemu.org/ChangeLog/5.2#9pfs
Best regards,
Christian Schoenebeck
- Re: tools/virtiofs: Multi threading seems to hurt performance, (continued)
- Re: tools/virtiofs: Multi threading seems to hurt performance, Dr. David Alan Gilbert, 2020/09/21
- Re: tools/virtiofs: Multi threading seems to hurt performance, Dr. David Alan Gilbert, 2020/09/21
- Re: tools/virtiofs: Multi threading seems to hurt performance, Dr. David Alan Gilbert, 2020/09/22
- Re: tools/virtiofs: Multi threading seems to hurt performance, Vivek Goyal, 2020/09/22
- Re: tools/virtiofs: Multi threading seems to hurt performance, Venegas Munoz, Jose Carlos, 2020/09/24
- virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Vivek Goyal, 2020/09/24
- Re: virtiofs vs 9p performance,
Christian Schoenebeck <=
- Re: virtiofs vs 9p performance, Vivek Goyal, 2020/09/25
- Re: virtiofs vs 9p performance, Christian Schoenebeck, 2020/09/25
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Dr. David Alan Gilbert, 2020/09/25
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Christian Schoenebeck, 2020/09/25
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Dr. David Alan Gilbert, 2020/09/25
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Christian Schoenebeck, 2020/09/25
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Christian Schoenebeck, 2020/09/25
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Dr. David Alan Gilbert, 2020/09/25
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Christian Schoenebeck, 2020/09/27
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Vivek Goyal, 2020/09/29