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From: Miklos Szeredi <miklos@szeredi.hu>
To: Stefan Hajnoczi <stefanha@redhat.com>
Cc: wangyan <wangyan122@huawei.com>,
	linux-fsdevel@vger.kernel.org,
	"virtio-fs@redhat.com" <virtio-fs@redhat.com>,
	Miklos Szeredi <mszeredi@redhat.com>
Subject: Re: [Virtio-fs] [QUESTION] A performance problem for buffer write compared with 9p
Date: Wed, 21 Aug 2019 09:51:20 +0200	[thread overview]
Message-ID: <CAJfpegs8fSLoUaWKhC1543Hoy9821vq8=nYZy-pw1+95+Yv4gQ@mail.gmail.com> (raw)
In-Reply-To: <20190820091650.GE9855@stefanha-x1.localdomain>

On Tue, Aug 20, 2019 at 11:16 AM Stefan Hajnoczi <stefanha@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..

Thanks,
Miklos

  reply	other threads:[~2019-08-21  7:51 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-15  0:30 [QUESTION] A performance problem for buffer write compared with 9p wangyan
2019-08-15  0:56 ` Gao Xiang
2019-08-20  9:16 ` [Virtio-fs] " Stefan Hajnoczi
2019-08-21  7:51   ` Miklos Szeredi [this message]
2019-08-21 16:05     ` Stefan Hajnoczi
2019-08-22  0:59       ` wangyan
2019-08-22 11:43         ` Miklos Szeredi
2019-08-22 12:48           ` wangyan
2019-08-22 13:07             ` Miklos Szeredi
2019-08-22 13:17               ` wangyan
2019-08-22 13:29                 ` Miklos Szeredi
2019-08-22 14:02                   ` Miklos Szeredi
     [not found]                     ` <fd7a2791-d95c-3bd9-e387-b8778a9eca83@huawei.com>
2019-08-26 12:39                       ` Miklos Szeredi
2019-08-28  0:57                         ` wangyan

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