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Date:   Tue, 14 Jun 2022 21:23:07 +0800
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Subject: Re: [RFC 0/5] support nonblock submission for splice pipe to pipe
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From:   Hao Xu <hao.xu@linux.dev>
To:     io-uring@vger.kernel.org
Cc:     Jens Axboe <axboe@kernel.dk>,
        Pavel Begunkov <asml.silence@gmail.com>,
        linux-fsdevel@vger.kernel.org,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Kuniyuki Iwashima <kuniyu@amazon.co.jp>
References: <20220607080619.513187-1-hao.xu@linux.dev>
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On 6/7/22 16:06, Hao Xu wrote:
> From: Hao Xu <howeyxu@tencent.com>
> 
> splice from pipe to pipe is a trivial case, and we can support nonblock
> try for it easily. splice depends on iowq at all which is slow. Let's
> build a fast submission path for it by supporting nonblock.
> 
> Wrote a simple test to test time spent of splicing from pipe to pipe:
> 
> 
> Did 50 times test for each, ignore the highest and lowest number,
> calculate the average number:
> 
> before patchset: 119.85 usec
> with patchset: 29.5 usec
> 

Hi Al,
Any comments on this one?

Regards,
Hao