From: jamal <hadi@cyberus.ca>
To: Arthur Kepner <akepner@sgi.com>
Cc: Lennert Buytenhek <buytenh@wantstofly.org>,
netdev@oss.sgi.com, jesse.barnes@intel.com, gnb@sgi.com
Subject: Re: [PATCH] use mmiowb in tg3_poll
Date: Tue, 31 May 2005 08:53:42 -0400 [thread overview]
Message-ID: <1117544022.6134.54.camel@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.61.0505300925570.11645@linux.site>
On Mon, 2005-30-05 at 09:30 -0700, Arthur Kepner wrote:
> I quickly looked through the records that I have and, unfortunately,
> wasn't able to locate raw data. But I found some scrawlings in my
> notes which say the most recent measurements for an Altix are:
>
> i) PIO read latency ~ 2.4 usec
> ii) mmiowb() latency ~ 1.1 usec
>
In terms of CPU cycles, how many do the above compute to be?
The absolute time numbers you have are also useful for quantification
purposes.
Did i read correctly that your reads are about 2x more expensive than
the writes?
cheers,
jamal
next prev parent reply other threads:[~2005-05-31 12:53 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200410211613.19601.jbarnes@engr.sgi.com>
2004-10-21 23:28 ` [PATCH] use mmiowb in tg3.c Jesse Barnes
2004-10-21 23:40 ` David S. Miller
2004-10-22 1:16 ` Benjamin Herrenschmidt
2004-10-22 1:33 ` akepner
2004-10-22 2:07 ` Benjamin Herrenschmidt
2004-10-22 3:01 ` Jesse Barnes
2004-10-22 4:00 ` Paul Mackerras
2004-10-22 20:51 ` [PATCH] use mmiowb in tg3_poll akepner
2005-05-28 23:12 ` Lennert Buytenhek
2005-05-30 16:30 ` Arthur Kepner
2005-05-31 12:53 ` jamal [this message]
2005-05-31 16:45 ` Jesse Barnes
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