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From: ebiederm@xmission.com (Eric W. Biederman)
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "David S. Miller" <davem@redhat.com>,
	hadi@cyberus.ca, akpm@digeo.com, manfred@colorfullife.com,
	netdev@oss.sgi.com, linux-kernel@vger.kernel.org
Subject: Re: Info: NAPI performance at "low" loads
Date: 19 Sep 2002 08:58:49 -0600	[thread overview]
Message-ID: <m1d6rakouu.fsf@frodo.biederman.org> (raw)
In-Reply-To: <1032371453.20463.139.camel@irongate.swansea.linux.org.uk>

Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

> On Wed, 2002-09-18 at 18:27, Eric W. Biederman wrote:
> > Plus I have played with calibrating the TSC with outb to port
> > 0x80 and there was enough variation that it was unuseable.  On some
> > newer systems it would take twice as long as on some older ones.
> 
> port 0x80 isnt going to PCI space.

Agreed.  It isn't going anywhere, and it takes it a while to recogonize
that.
 
> x86 generally posts mmio write but not io write. Thats quite measurable.

The difference timing difference between posted and non-posted writes
I can see.

Eric


  reply	other threads:[~2002-09-19 15:08 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-17 19:53 Info: NAPI performance at "low" loads Manfred Spraul
2002-09-17 20:59 ` David S. Miller
2002-09-17 21:32   ` Andrew Morton
2002-09-17 21:26     ` David S. Miller
2002-09-17 21:45       ` 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
2002-09-18 17:27                 ` Eric W. Biederman
2002-09-18 17:50                   ` Alan Cox
2002-09-19 14:58                     ` Eric W. Biederman [this message]
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

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