[lkml]   [2002]   [Jan]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [Lse-tech] zerocopy pipe, new version
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.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:23    [W:0.049 / U:33.348 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site