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

[wangyan]

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

Thanks,
Yan Wang