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List: linux-vortex
Subject: Re: [vortex] Problems with 3c59x
From: "Lists (lst)" <linux () lapd ! cj ! edu ! ro>
Date: 2002-12-14 12:19:11
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On Sat, 14 Dec 2002, Bogdan Costescu wrote:
> > I don't understand this. Be more explicit and tell me what to do when the
> > card hangs again.
> Just before that line there should have been one with a "status" value.
> This value presumably has the lowest significant bit set, of a probable
> form of 0xeXX1.
Got to http://linux.dej.ro/3c59x/kernel.txt to see the logs in that
period.
> > Why the card loosing the interrupt? Is this a kernel bug, a driver bug or
> > a mainboard bug?
>
> It's not the card, it's the whole system. The card generates the signal,
> but the interrupt routine from the driver is not called. The generation of
> signal from the card is a state kept until explicitly cleared, so it can
> be checked whenever other driver code is executed.
> So there is no driver bug; but between a kernel and mainboard bug, I can't
> tell... There have been problems with some older kernel versions, that
> were supposed to be fixed some time ago. Also being on the linux-smp list
> I frequently got messages about problems with the SMP VIA chipset that
> were solved by upgrading BIOS or changing the BIOS MPS level.
I have also VIA chipset. In precedent e-mail I told you what happens after
BIOS upgrade and MPS changing.
> The difference is in handling of interrupts: noapic disables the IO-APIC,
> which makes interrupts function in XT-PIC mode which is the mode used
> on uniprocessor machines. This will make interrupt requests only be
> delivered to one CPU which will also be the only CPU servicing the
> interrupt routines from drivers. In some cases this is a good thing as it
> provides better cache locality, while for a system which receives very
> many interrupts, it might degrade performance.
Hmm ... for the moment I will wait to see what happens.
Thank you/Multumesc ;),
Cosmin
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