From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
To: Chirantan Ekbote <chirantan@chromium.org>
Cc: virtio-fs-list <virtio-fs@redhat.com>,
qemu-devel@nongnu.org, Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [Virtio-fs] tools/virtiofs: Multi threading seems to hurt performance
Date: Fri, 25 Sep 2020 12:35:12 +0100 [thread overview]
Message-ID: <20200925113512.GH2873@work-vm> (raw)
In-Reply-To: <CAJFHJroSeg=Zk1VaHBzwurNTkziFzupiiVf_Y-2TDQ7nmdAERg@mail.gmail.com>
* Chirantan Ekbote (chirantan@chromium.org) wrote:
> On Sat, Sep 19, 2020 at 6:36 AM Vivek Goyal <vgoyal@redhat.com> wrote:
> >
> > Hi All,
> >
> > virtiofsd default thread pool size is 64. To me it feels that in most of
> > the cases thread pool size 1 performs better than thread pool size 64.
> >
> > I ran virtiofs-tests.
> >
> > https://github.com/rhvgoyal/virtiofs-tests
> >
> > And here are the comparision results. To me it seems that by default
> > we should switch to 1 thread (Till we can figure out how to make
> > multi thread performance better even when single process is doing
> > I/O in client).
> >
>
> FWIW, we've observed the same behavior in crosvm. Using a thread pool
> for the virtiofs server consistently gave us worse performance than
> using a single thread.
Interesting; so it's not just us doing something silly!
It does feel like you *should* be able to get some benefit from multiple
threads; so I guess some more investigation needed at some time.
Dave
> Chirantan
>
> _______________________________________________
> Virtio-fs mailing list
> Virtio-fs@redhat.com
> https://www.redhat.com/mailman/listinfo/virtio-fs
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
prev parent reply other threads:[~2020-09-25 11:36 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-18 21:34 tools/virtiofs: Multi threading seems to hurt performance Vivek Goyal
2020-09-21 8:39 ` Stefan Hajnoczi
2020-09-21 13:39 ` Vivek Goyal
2020-09-21 16:57 ` Stefan Hajnoczi
2020-09-21 8:50 ` Dr. David Alan Gilbert
2020-09-21 13:35 ` Vivek Goyal
2020-09-21 14:08 ` Daniel P. Berrangé
2020-09-21 15:32 ` Dr. David Alan Gilbert
2020-09-22 10:25 ` Dr. David Alan Gilbert
2020-09-22 17:47 ` Vivek Goyal
2020-09-24 21:33 ` Venegas Munoz, Jose Carlos
2020-09-24 22:10 ` virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance) Vivek Goyal
2020-09-25 8:06 ` virtiofs vs 9p performance Christian Schoenebeck
2020-09-25 13:13 ` Vivek Goyal
2020-09-25 15:47 ` Christian Schoenebeck
2021-02-19 16:08 ` Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance) Vivek Goyal
2021-02-19 17:33 ` Christian Schoenebeck
2021-02-19 19:01 ` Vivek Goyal
2021-02-20 15:38 ` Christian Schoenebeck
2021-02-22 12:18 ` Greg Kurz
2021-02-22 15:08 ` Christian Schoenebeck
2021-02-22 17:11 ` Greg Kurz
2021-02-23 13:39 ` Christian Schoenebeck
2021-02-23 14:07 ` Michael S. Tsirkin
2021-02-24 15:16 ` Christian Schoenebeck
2021-02-24 15:43 ` Dominique Martinet
2021-02-26 13:49 ` Christian Schoenebeck
2021-02-27 0:03 ` Dominique Martinet
2021-03-03 14:04 ` Christian Schoenebeck
2021-03-03 14:50 ` Dominique Martinet
2021-03-05 14:57 ` Christian Schoenebeck
2020-09-25 12:41 ` virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance) Dr. David Alan Gilbert
2020-09-25 13:04 ` Christian Schoenebeck
2020-09-25 13:05 ` Dr. David Alan Gilbert
2020-09-25 16:05 ` Christian Schoenebeck
2020-09-25 16:33 ` Christian Schoenebeck
2020-09-25 18:51 ` Dr. David Alan Gilbert
2020-09-27 12:14 ` Christian Schoenebeck
2020-09-29 13:03 ` Vivek Goyal
2020-09-29 13:28 ` Christian Schoenebeck
2020-09-29 13:49 ` Vivek Goyal
2020-09-29 13:59 ` Christian Schoenebeck
2020-09-29 13:17 ` Vivek Goyal
2020-09-29 13:49 ` [Virtio-fs] " Miklos Szeredi
2020-09-29 14:01 ` Vivek Goyal
2020-09-29 14:54 ` Miklos Szeredi
2020-09-29 15:28 ` Vivek Goyal
2020-09-25 12:11 ` tools/virtiofs: Multi threading seems to hurt performance Dr. David Alan Gilbert
2020-09-25 13:11 ` Vivek Goyal
2020-09-21 20:16 ` Vivek Goyal
2020-09-22 11:09 ` Dr. David Alan Gilbert
2020-09-22 22:56 ` Vivek Goyal
2020-09-23 12:50 ` [Virtio-fs] " Chirantan Ekbote
2020-09-23 12:59 ` Vivek Goyal
2020-09-25 11:35 ` Dr. David Alan Gilbert [this message]
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