From: Lionel Bouton <Lionel.Bouton@inet6.fr>
To: Michael Frank <mhf@linuxmail.org>
Cc: kernel mailing list <linux-kernel@vger.kernel.org>
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 13:26:35 +0100 [thread overview]
Message-ID: <4059957B.2010704@inet6.fr> (raw)
In-Reply-To: <opr41292b64evsfm@smtp.pacific.net.th>
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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next prev parent reply other threads:[~2004-03-18 12:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-18 10:52 2.6.4 under heavy ioload disables sis5513 DMA Michael Frank
2004-03-18 11:30 ` SiS APIC, hacker looking for docs/help, was : " Lionel Bouton
2004-03-18 11:52 ` Michael Frank
2004-03-18 12:26 ` Lionel Bouton [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-03-18 13:48 Ross Dickson
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