Messages in this thread | | | From | Ross Dickson <> | Subject | Re: SiS APIC, hacker looking for docs/help, was : Re: 2.6.4 under heavy ioload disables sis5513 DMA | Date | Thu, 18 Mar 2004 23:48:26 +1000 |
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<snip> > > 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.
I had a report that my patch helped an sis740 board run in apic ioapic mode. Don't know if it would help your situation. Here is relevant link. http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-03/4278.html
There is a problem with apm mode with my patch - small fix here if reqd. http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-03/4410.html
Hope it helps. Ross.
> > 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. > >
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