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Date: Thu, 26 Dec 2002 13:37:10 +0100
From: Frank van Maarseveen <F.vanMaarseveen@inter.NL.net>
To: Mikael Olenfalk <mikael@netgineers.se>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Alot of DMA errors in 2.4.18, 2.4.20 and 2.5.52
Message-ID: <20021226123710.GA2442@iapetus.localdomain>
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On Wed, Dec 25, 2002 at 12:58:20PM +0100, Tomas Szepe wrote:
> > For some funny reason, a 2.4.20 kernel refuses to set the DMA-level on
> > the new disks (all connected to a UDMA5-capable Ultra100 TX2 controller)
> > to UDMA5,4,3 and settles it for UDMA2, which is the highest possibility
> > for the OLD onboard-controller (but NOT for the promise card).
> 
> You need to boot 2.4.19 and 2.4.20 with 'ideX=ata66' where X is the
> number of the channel where you wish to use transfer modes above UDMA2.
> For instance, "ide0=ata66 ide1=ata66" will do the trick for the first two

hdparm -X69 /dev/hda will put it into UDMA5/ata100 mode as well
(69 == 64 + UDMA mode). No need to specify it at boot time.

(this discussion reminded me of my own TX2 adapter and 100GB disk:
 adjusting its setting improved sequential disk reads: now 36MB/sec
 instead of 24MB/sec)

-- 
Frank
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