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SubjectRe: SiS APIC, hacker looking for docs/help, was : Re: 2.6.4 under heavy ioload disables sis5513 DMA
Michael Frank wrote the following on 03/18/2004 12:52 PM :

>
>>
>> Is reading the arch/i386/kernel/*pic* files (and probably others) enough
>> to start or is there somewhere else to look for information ?
>>
>
> Dunno how DMA timeout is related to interrupts or are you suggesting it
> is loosing dma-complete interrupts?
>

I don't know the details (yet I hope), but I'm quite sure that interrupt
handling in XT-PIC mode leads to problems on several SiS configurations
(when you reorganize PCI cards in a system and the behaviour changes or
when you disable the VGA IRQ and some things start to work, the suspect
becomes obvious). One user reported that putting 2 disks on one channel
instead of one on each (so 1 IRQ used instead of 2) solve instability
issues too... I ruled out IDE driver problems several times by
repeatedly checking the code and the run-time register values against
known-good values. My lack of knowledge on the interrupt handling
details is what prevents me from being 100% sure that the problem lies
here. This is why I'm willing to work on this subject.

> Same board runs same and higher loads with 2.4.2[345] flawlessly. Also
> 8 hours OK with 2.4.26-pre4 last night + 430 cycles of swsusp2.
>

Now I remember why your name ringed a bell ! Thanks for your testing
work on swsusp, my amount of free time went up thanks to 2.4's swsusp.

Regards,

--
Lionel Bouton - inet6
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