Messages in this thread |  | | Date | Sat, 29 Sep 2001 20:27:52 +0100 | From | Steve Maughan <> | Subject | Re: 2.4.9-ac10 IDE access slows as uptime increases |
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* 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?
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