Messages in this thread | | | Date | Tue, 15 Jan 2002 14:57:47 -0500 | From | Benjamin LaHaise <> | Subject | Re: [Lse-tech] zerocopy pipe, new version |
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On Tue, Jan 15, 2002 at 12:20:25PM -0500, Hubertus Franke wrote: > Conclusion > ---------- > Manfred Spraul's new zero copy patch showed a very good performance > improvement for pipeflex as well as grep on both 2-way and 1-way. > By adding our large pipe support, performance improvement up to > 42% for pipeflex and 96% for grep benchmarks on 2-way systems. > No significant different has been observed for lmbench on 1-way systems. > The right way to configure the system than would be for UP and 1-way to > set the buffer size by default to 4K while for the SMP larger pipe buffers > should be encouraged.
Any conclusions are incomplete without mentioning the serious (30%+) degredation on UP systems under a good chunk of the benchmarks. Such aspects of the patch make it unsuitable as is for both the mainstream and vendor kernels.
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