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SubjectRe: Linux 2.4.20-pre4-ac1
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Hi Anssi!

* Anssi Saari writes:
>On Fri, Aug 23, 2002 at 06:46:02AM -0400, Alan Cox wrote:
>>IDE status
>[...]

>This new IDE stuff has certainly worsened my longstanding CD writing problem.
>Data writes go fine at 16x. Audio writes work fine at 16x in FreeBSD
>and Windows 98 with the same system. DMA is on, unmask_irq is on, 32bit
>transfers are on, but don't matter much.

If you burn data in DAO mode you will have the same behaviour. Have you
tried to toggle CONFIG_IDEPCI_SHARE_IRQ? It helped me a lot. Also I
have to disable umaskirq, otherwise I have the same problems.
Unfortunately I can't use the latest ac series because of a mysterious
problem with ide-scsi.
One thing I still do not understand is:
IS DMA (theoretically) possible for stuff like c2scans, DAO writing,
audio grabbing? From what I read in the LKML archives and from what
Andre wrote me, I'd say no, but on the other hand I can do a c2scan at
5MB/s with almost no processor usage. Can't really be PIO.

regards
Markus

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