From: Benjamin LaHaise <bcrl@redhat.com>
To: Hubertus Franke <frankeh@watson.ibm.com>
Cc: Manfred Spraul <manfred@colorfullife.com>,
linux-kernel@vger.kernel.org, lse-tech@lists.sourceforge.net
Subject: Re: [Lse-tech] zerocopy pipe, new version
Date: Tue, 15 Jan 2002 14:57:47 -0500 [thread overview]
Message-ID: <20020115145747.F6853@redhat.com> (raw)
In-Reply-To: <002701c19638$400f15f0$010411ac@local> <011001c19de8$ec1d4800$1cdb0209@diz.watson.ibm.com>
In-Reply-To: <011001c19de8$ec1d4800$1cdb0209@diz.watson.ibm.com>; from frankeh@watson.ibm.com on Tue, Jan 15, 2002 at 12:20:25PM -0500
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.
-ben
next prev parent reply other threads:[~2002-01-15 19:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-05 22:27 zerocopy pipe, new version Manfred Spraul
2002-01-15 17:20 ` [Lse-tech] " Hubertus Franke
2002-01-15 19:57 ` Benjamin LaHaise [this message]
2002-01-15 20:08 ` Manfred Spraul
2002-01-15 20:20 ` Benjamin LaHaise
2002-01-16 15:29 ` Hubertus Franke
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