On Thu, Aug 22, 2019 at 2:59 AM wangyan <wangyan122@huawei.com> wrote:
> I will test it when I get the patch, and post the compared result with
> 9p.

Could you please try the attached patch?  My guess is that it should
improve the performance, perhaps by a big margin.

Further improvement is possible by eliminating page copies, but that
is less trivial.

Thanks,
Miklos