[Virtio-fs] [QUESTION] A performance problem for buffer write compared with 9p

[Stefan Hajnoczi]

On Wed, Aug 21, 2019 at 09:51:20AM +0200, Miklos Szeredi wrote:
> On Tue, Aug 20, 2019 at 11:16 AM Stefan Hajnoczi <stefanha at redhat.com> wrote:
> >
> > On Thu, Aug 15, 2019 at 08:30:43AM +0800, wangyan wrote:
> > > Hi all,
> > >
> > > I met a performance problem when I tested buffer write compared with 9p.
> >
> > CCing Miklos, FUSE maintainer, since this is mostly a FUSE file system
> > writeback question.
> 
> This is expected.   FUSE contains lots of complexity in the buffered
> write path related to preventing DoS caused by the userspace server.
> 
> This added complexity, which causes the performance issue, could be
> disabled in virtio-fs, since the server lives on a different kernel
> than the filesystem.
> 
> I'll do a patch..

Great, thanks!  Maybe wangyan can try your patch to see how the numbers
compare to 9P.

Stefan
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