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

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On 2019/8/22 0:05, Stefan Hajnoczi wrote:
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@xxxxxxxxxx> 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

I will test it when I get the patch, and post the compared result with
9p.

Thanks,
Yan Wang




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