Re: Is splice() useful without page stealing?

From: Willy Tarreau
Date: Fri Dec 18 2009 - 01:35:09 EST

On Thu, Dec 17, 2009 at 06:47:19PM -0800, Patrick J. LoPresti wrote:
> Now, if splice() actually let you do things like flip pages from the
> network stack into the page cache with zero copies, then I could see
> the point. As it is, I am curious to know:
> 1) Does anybody have any actual benchmarks showing performance
> advantages for splice() over read()/write()? If so, can I obtain the
> benchmark code?

I did this for TCP->TCP sockets, and the gain is huge at high
bit rates (10 Gbps). Basically, 10 Gbps at 20% CPU with splice,
100% CPU with recv/send. You can find the test results here :

I'm not using splice for disk-to-net nor net-to-disk transfers though.


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