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From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Jesse Barnes <jbarnes@sgi.com>, Tim Hockin <thockin@hockin.org>
Cc: Andi Kleen <ak@suse.de>, linux-kernel@vger.kernel.org
Subject: Re: Memory mapped IO vs Port IO
Date: Fri, 12 Sep 2003 11:58:07 -0700	[thread overview]
Message-ID: <223220000.1063393087@flay> (raw)
In-Reply-To: <20030912182430.GA1043@sgi.com>

>> Also - a perhaps more useful test is a write followed by a read.
> 
> Well, someone else will have to run that test.  On Altix, a read() is
> freakishly expensive, and I'm not really interested in showing everyone
> how bad it is ;)

I find percentile comparisons useful for hiding the embarassement
of occasional hardware realities ;-) (ie what's the speed *ratio*
between the two types of read).

M.


  parent reply	other threads:[~2003-09-12 19:09 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20030911192550.7dfaf08c.ak@suse.de.suse.lists.linux.kernel>
     [not found] ` <1063308053.4430.37.camel@huykhoi.suse.lists.linux.kernel>
     [not found]   ` <20030912162713.GA4852@sgi.com.suse.lists.linux.kernel>
     [not found]     ` <20030912174807.GA629@sgi.com.suse.lists.linux.kernel>
2003-09-12 18:00       ` Memory mapped IO vs Port IO Andi Kleen
2003-09-12 18:04         ` Jesse Barnes
2003-09-12 18:09           ` Andi Kleen
2003-09-12 18:11         ` Tim Hockin
2003-09-12 18:24           ` Jesse Barnes
2003-09-12 18:29             ` Andi Kleen
2003-09-12 18:58             ` Martin J. Bligh [this message]
2003-09-12 19:51               ` Jesse Barnes
2003-09-12 16:41 John Bradford
2003-09-12 21:52 ` Mike Fedyk
2003-09-13  4:01   ` Mike Fedyk
     [not found] <20030911160116.GI21596@parcelfarce.linux.theplanet.co.uk.suse.lists.linux.kernel>
2003-09-11 16:17 ` Andi Kleen
2003-09-11 16:25   ` Matthew Wilcox
2003-09-11 16:31     ` Andi Kleen
2003-09-11 16:42       ` Matthew Wilcox
2003-09-11 17:12       ` Jamie Lokier
2003-09-11 17:25         ` Andi Kleen
2003-09-12  1:39           ` jw schultz
2003-09-12 16:10           ` Anthony Dominic Truong
2003-09-12 16:22             ` Jamie Lokier
2003-09-12 16:27             ` Jesse Barnes
2003-09-12 17:48               ` Jesse Barnes
2003-09-11 17:13   ` Jamie Lokier
     [not found] ` <20030911161450.GA23536@sgi.com.suse.lists.linux.kernel>
2003-09-11 16:20   ` Andi Kleen
  -- strict thread matches above, loose matches on Subject: below --
2003-09-11 16:01 Matthew Wilcox
2003-09-11 16:14 ` Måns Rullgård
2003-09-11 16:14 ` Jesse Barnes

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