From: "Justin T. Gibbs" <gibbs@scsiguy.com>
To: Markus Walser <walser@scs.ch>
Cc: linux-kernel@vger.kernel.org
Subject: Re: aic7xxx bus speed
Date: Tue, 15 Jan 2002 08:50:04 -0700 [thread overview]
Message-ID: <200201151550.g0FFo4Z00346@aslan.scsiguy.com> (raw)
In-Reply-To: Your message of "Tue, 15 Jan 2002 16:30:02 +0100." <3C444AFA.8000605@scs.ch>
>Hi
>I've an aic7899: Ultra160 Wide scsi controller with a few disks
>under an alpha ds20 running.
>Now I'm having troubles getting 160MB/s bus speed on the
>actual kernels (2.4.18pre2/2.5.2pre9). On the kernel 2.2.18 and
>the redhat kernels 2.4.3-12, 2.4.9-13 I get full speed of 160MB/s.
>But on the new kernel I get just 80MB/s per bus.
You probably have IBM drives that say they are SCSI-2 yet can do
160 speeds. There is a check in the driver that prevents it from
negotiating from SCSI-2 drives so as to not blow up on SCSI-2 devices
that don't support the new negotiation message type. I have a fix
to work around IBM's mistake in the next driver release.
--
Justin
prev parent reply other threads:[~2002-01-15 15:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-15 15:30 Markus Walser
2002-01-15 15:50 ` Justin T. Gibbs [this message]
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