From: Arjan van de Ven <arjan@infradead.org>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Jan-Bernd Themann <ossthema@de.ibm.com>,
netdev@vger.kernel.org, Christoph Raisch <raisch@de.ibm.com>,
Jan-Bernd Themann <themann@de.ibm.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-ppc <linuxppc-dev@ozlabs.org>,
Marcus Eder <meder@de.ibm.com>,
Thomas Klein <osstklei@de.ibm.com>,
Thomas Klein <tklein@de.ibm.com>
Subject: Re: [2.6.19 PATCH 1/7] ehea: interface to network stack
Date: Fri, 18 Aug 2006 15:56:17 +0200 [thread overview]
Message-ID: <1155909377.4494.192.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <20060818134728.GB5201@martell.zuzino.mipt.ru>
On Fri, 2006-08-18 at 17:47 +0400, Alexey Dobriyan wrote:
> On Fri, Aug 18, 2006 at 01:29:01PM +0200, Jan-Bernd Themann wrote:
>
> Was there noticeable performance difference when explicit prefetching is
> removed? At some (invisible) point CPUs will become smarter about prefetching
> than programmers and this code will be slower than possible.
Hi,
what you say is true in general, however the packet response part of the
kernel is special; the cpu just cannot know where your card just dma'd
the packet to (and thus cleared it from any caches anywhere in the
system) so it's going to be pretty much a 100% cachemiss always...
Greetings,
Arjan van de Ven
next prev parent reply other threads:[~2006-08-18 13:56 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-18 11:29 Jan-Bernd Themann
2006-08-18 13:47 ` Alexey Dobriyan
2006-08-18 13:56 ` Arjan van de Ven [this message]
2006-08-18 14:44 ` Alexey Dobriyan
2006-08-21 12:23 ` Jan-Bernd Themann
2006-08-21 13:18 ` Jörn Engel
2006-08-21 14:52 ` Thomas Klein
2006-08-22 12:51 Jan-Bernd Themann
2006-08-23 8:56 Jan-Bernd Themann
2006-09-04 10:37 Jan-Bernd Themann
2006-09-04 20:16 ` Francois Romieu
2006-09-04 21:11 ` Arnd Bergmann
2006-09-04 21:49 ` Francois Romieu
2006-09-06 15:22 ` Jeff Garzik
2006-09-05 15:09 ` Thomas Klein
2006-09-05 18:58 ` Francois Romieu
2006-09-06 12:53 ` Jan-Bernd Themann
2006-09-06 13:30 Jan-Bernd Themann
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