From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <bb33e3b2b9a72ee3c0557a2008b3797b@quanstro.net>
From: erik quanstrom <quanstro@quanstro.net>
Date: Thu, 21 Sep 2006 18:22:20 -0500
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Re: venti+fossil problems on new install
In-Reply-To: <7e5a78be741c6f2d3bcc83d295f1ba21@plan9.bell-labs.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Topicbox-Message-UUID: bd673dfa-ead1-11e9-9d60-3106f5b1d025

thanks for pointing out my misunderstanding.

if dma is enabled, why does my nForce4 chipset get such bad SATA
performance?  "dd -if /dev/sdF0/data -count n" maxes out at ~3MB/sec.

this is the drive configuration:

ladd# cat /dev/sdE0/ctl
inquiry WDC WD2500JS-00MHB0                     
config 427A capabilities 2F00 dma 00550040 dmactl 00000000 rwm 16 rwmctl 0 lba48always off
geometry 488395055 512 16383 16 63
[etc.]

- erik