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From: "David S. Miller" <davem@redhat.com>
To: ebiederm@xmission.com
Cc: 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: Wed, 18 Sep 2002 13:23:34 -0700 (PDT)	[thread overview]
Message-ID: <20020918.132334.102949210.davem@redhat.com> (raw)
In-Reply-To: <m1hegnky2h.fsf@frodo.biederman.org>

   From: ebiederm@xmission.com (Eric W. Biederman)
   Date: 18 Sep 2002 11:27:34 -0600

   "David S. Miller" <davem@redhat.com> writes:
   
   > {in,out}{b,w,l}() operations have a fixed timing, therefore his
   > results doesn't sound that far off.
   ????
   
   I don't see why they should be.  If it is a pci device the cost should
   the same as a pci memory I/O.  The bus packets are the same.  So things like
   increasing the pci bus speed should make it take less time.

The x86 processor has a well defined timing for executing inb
etc. instructions, the timing is fixed and is independant of the
speed of the PCI bus the device is on.

  parent reply	other threads:[~2002-09-18 20:28 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
2002-09-18 20:23                   ` David S. Miller [this message]
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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