SiS APIC, hacker looking for docs/help, was : Re: 2.6.4 under heavy ioload disables sis5513 DMA

[Lionel Bouton <Lionel.Bouton@inet6.fr>]

Michael Frank wrote the following on 03/18/2004 11:52 AM :
> Happens every few hours with heavy io and cpu load:
> 
> hda: dma_timer_expiry: dma status == 0x21
> hda: DMA timeout error
> hda: dma timeout error: status=0xd0 { Busy }
> 
> hda: DMA disabled
> ide0: reset: success
> 
> DMA auto-reenabled by boot time hdparm -k
> 

Hum, I'm wondering if -k is fully functionnal (hdparm man page hints 
that this isn't supported by all drives and I don't remember any 
success/failure stories here).

> lspci -vv
> 
> 00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] 

SiS chipset : is APIC functionnal ? (cat /proc/interrupts)

If not, I believe this might be the problem and the solutions still 
eludes me (I don't think the problem lies in the IDE driver but in APIC 
support).

I've 2 SiS based mainboards forced to use XT-PIC (SiS735 and SiS645 
based) here but without this kind of problems (everything works until I 
start to add to many PCI cards in one system...). I'm willing to start 
hacking around (mostly on the 645 as the 735 is an always-on system).

Is reading the arch/i386/kernel/*pic* files (and probably others) enough 
to start or is there somewhere else to look for information ?

Regards,
-- 
Lionel Bouton - inet6
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