qemu-devel.nongnu.org archive mirror
 help / color / mirror / Atom feed
From: Vivek Goyal <vgoyal@redhat.com>
To: Christian Schoenebeck <qemu_oss@crudebyte.com>
Cc: "Shinde, Archana M" <archana.m.shinde@intel.com>,
	"Venegas Munoz,
	Jose Carlos" <jose.carlos.venegas.munoz@intel.com>,
	qemu-devel@nongnu.org,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	virtio-fs-list <virtio-fs@redhat.com>, Greg Kurz <groug@kaod.org>,
	Stefan Hajnoczi <stefanha@redhat.com>,
	"cdupontd@redhat.com" <cdupontd@redhat.com>
Subject: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance)
Date: Fri, 19 Feb 2021 11:08:48 -0500	[thread overview]
Message-ID: <20210219160848.GB3270@redhat.com> (raw)
In-Reply-To: <17216624.eqST2d0sUl@silver>

On Fri, Sep 25, 2020 at 10:06:41AM +0200, Christian Schoenebeck wrote:
> 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

Hi Christian,

I am not able to set msize to a higher value. If I try to specify msize
16MB, and then read back msize from /proc/mounts, it sees to cap it
at 512000. Is that intended?

$ mount -t 9p -o trans=virtio,version=9p2000.L,cache=none,msize=16777216 hostShared /mnt/virtio-9p

$ cat /proc/mounts | grep 9p
hostShared /mnt/virtio-9p 9p rw,sync,dirsync,relatime,access=client,msize=512000,trans=virtio 0 0

I am using 5.11 kernel.

Thanks
Vivek



  parent reply	other threads:[~2021-02-19 16:19 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             ` Vivek Goyal [this message]
2021-02-19 17:33               ` Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance) 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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210219160848.GB3270@redhat.com \
    --to=vgoyal@redhat.com \
    --cc=archana.m.shinde@intel.com \
    --cc=cdupontd@redhat.com \
    --cc=dgilbert@redhat.com \
    --cc=groug@kaod.org \
    --cc=jose.carlos.venegas.munoz@intel.com \
    --cc=qemu-devel@nongnu.org \
    --cc=qemu_oss@crudebyte.com \
    --cc=stefanha@redhat.com \
    --cc=virtio-fs@redhat.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).