From: Andrew Morton <akpm@digeo.com>
To: "David S. Miller" <davem@redhat.com>
Cc: hadi@cyberus.ca, manfred@colorfullife.com, netdev@oss.sgi.com,
linux-kernel@vger.kernel.org
Subject: Re: Info: NAPI performance at "low" loads
Date: Tue, 17 Sep 2002 19:16:25 -0700 [thread overview]
Message-ID: <3D87E1F9.33909AC8@digeo.com> (raw)
In-Reply-To: 20020917.180014.07882539.davem@redhat.com
"David S. Miller" wrote:
>
> From: jamal <hadi@cyberus.ca>
> Date: Tue, 17 Sep 2002 20:57:58 -0400 (EDT)
>
> I am not so sure with that 6% difference there is no other bug lurking
> there; 6% seems too large for an extra two PCI transactions per packet.
>
> {in,out}{b,w,l}() operations have a fixed timing, therefore his
> results doesn't sound that far off.
>
> It is also one of the reasons I suspect Andrew saw such bad results
> with 3c59x, but probably that is not the only reason.
They weren't "very bad", iirc. Maybe a 5% increase in CPU load.
It was all a long time ago. Will retest if someone sends URLs.
next prev parent reply other threads:[~2002-09-18 2:16 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3D879F59.6BDF9443@digeo.com>
[not found] ` <20020917.142635.114214508.davem@redhat.com>
2002-09-17 21:45 ` Info: NAPI performance at "low" loads Andrew Morton
2002-09-17 21:39 ` David S. Miller
2002-09-17 21:54 ` Jeff Garzik
2002-09-17 21:49 ` David S. Miller
2002-09-18 2:11 ` Jeff Garzik
2002-09-18 2:06 ` David S. Miller
2002-09-18 2:36 ` Jeff Garzik
2002-09-17 21:58 ` Andrew Morton
2002-09-18 0:57 ` jamal
2002-09-18 1:00 ` David S. Miller
2002-09-18 2:16 ` Andrew Morton [this message]
2002-09-18 17:27 ` Eric W. Biederman
2002-09-18 17:50 ` Alan Cox
2002-09-19 14:58 ` Eric W. Biederman
2002-09-18 20:23 ` David S. Miller
2002-09-18 20:43 ` Alan Cox
2002-09-18 20:46 ` David S. Miller
2002-09-18 21:15 ` Alan Cox
2002-09-18 21:22 ` David S. Miller
2002-09-19 15:03 ` Eric W. Biederman
2002-09-19 15:53 ` Alan Cox
2002-09-17 19:54 Manfred Spraul
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