Messages in this thread | | | Date | Fri, 18 Dec 2009 07:34:54 +0100 | From | Willy Tarreau <> | Subject | Re: Is splice() useful without page stealing? |
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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 :
http://haproxy.1wt.eu/10g.html
I'm not using splice for disk-to-net nor net-to-disk transfers though.
Willy
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