From: Steve Maughan <saxm@dcs.ed.ac.uk>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: George Garvey <tmwg-linuxknl@inxservices.com>,
linux-kernel@vger.kernel.org
Subject: Re: 2.4.9-ac10 IDE access slows as uptime increases
Date: Sat, 29 Sep 2001 20:27:52 +0100 [thread overview]
Message-ID: <20010929202752.A25602@ummagumma> (raw)
In-Reply-To: <20010928204612.A911@inxservices.com> <E15nLB7-00027t-00@the-village.bc.nu>
In-Reply-To: <E15nLB7-00027t-00@the-village.bc.nu>; from alan@lxorguk.ukuu.org.uk on Sat, Sep 29, 2001 at 03:33:17PM +0100
* Alan Cox (alan@lxorguk.ukuu.org.uk) wrote:
> Second question is what is in your IDE logs. The IDE layer will change
> down speeds when it hits a repeated problem (eg a DMA timeout) so if
> need be will switch back to PIO or to MWDMA.
I have what sounds like a similar problem - assuming it is a problem
with the IDE layer dropping the speed - except mine is with my CD or
DVD drive. They run a lot slower under the 2.4.x kernels than under
2.2.19 (looking at 2-3megs/s under 2.4.x, 5-7megs/s under 2.2.19).
Also when using 2.4.x, the kernel has a habit of disabling DMA and
performance plummets. Yet it is fine with 2.2.19.
Is this a related issue? Is there a fix for this?
Steve Maughan
next prev parent reply other threads:[~2001-09-29 19:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-29 3:46 George Garvey
2001-09-29 14:33 ` Alan Cox
2001-09-29 15:53 ` Phil Blecker
2001-09-30 6:21 ` George Garvey
2001-09-29 19:27 ` Steve Maughan [this message]
2001-09-29 19:31 ` Alan Cox
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