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Subject: Re: IDE/ATAPI in 2.5
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Mathieu Chouquet-Stringer <mathieu@newview.com>
Cc: linux-kernel@vger.kernel.org
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References: <200207142004.g6EK4LaV019433@burner.fokus.gmd.de>
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Date: 14 Jul 2002 22:59:42 +0100
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On Sun, 2002-07-14 at 21:43, Mathieu Chouquet-Stringer wrote:
> alan@lxorguk.ukuu.org.uk (Alan Cox) writes:
> > On Sun, 2002-07-14 at 21:21, Mathieu Chouquet-Stringer wrote:
> > > I'm running tar (the regular version not star) right now on an Athlon @
> > > 850. The fs is ext3 and the disk is a scsi drive.
> > > So far, tar has been running for 17 min 25 sec, and that's what top says:
> > > CPU states:  1.7% user, 98.2% system,  0.0% nice,  0.0% idle
> >                  ^^^^^^^^^^^^^^^^^^^^^^^^
> > 
> > Why are using PIO mode devices ?
> 
> I'm using SCSI :
> Jul 13 16:35:50 mcs kernel: SCSI subsystem driver Revision: 1.00

Intriguing. Something horrible is happening on your system to see 98%
system time off a bus mastering DMA controller. It should only look like
that on things like an AHA152x 

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