Re: Undo aic7xxx changes (now rc7+aic20030603)

From: Stephan von Krawczynski (
Date: Tue Jun 10 2003 - 05:30:15 EST

On Mon, 9 Jun 2003 21:38:16 -0400 (EDT)
Zwane Mwaikambo <> wrote:

> On Mon, 9 Jun 2003, Stephan von Krawczynski wrote:
> > During the whole testing with SMP I recognised that the tar-verify always
> > brought up "content differs" warnings. Which basically means that the
> > filesize is ok but the content is not. As there might be various causes for
> > this (bad tape, bad drive, bad cabling) I did not give very much about it.
> > But it turns out there are no more such warnings when using an UP kernel
> > (on the same box with the complete same hardware including tapes).
> >
> > >From this experience I would conclude the following (for my personal test
> > case):
> Can you also try this with 2.5?

Uh, do I trust Linus ? ;-) Well, probably I am going to take a look. The whole
story eats a lot of time as I have to deal with GBs of data for every single

> > 1) aic-driver has problems with smp/up switching (meaning crashes when
> > trying an SMP build with nosmp). This is completely reproducable.
> Can you also try an SMP kernel with noapic?

Can you clarify? Do you mean options "nosmp noapic" or just "noapic" on SMP

> > 2) aic-driver (almost no matter what version) has problems with SMP setup
> > and tape drives. Obviously data integrity is not given. This is completely
> > reproducable in my test setup.
> I have had problems with symmetric interrupt handling but can normally get
> it working with noapic. And no it doesn't appear to be an interrupt
> routing problem on my box (If it is someone please clearly state what the
> exact problem is to me)

Hm, my question is: if it were exclusively an apic problem, why do other
controllers (in a filesystem environment) work flawlessly. Maybe the driver and
apic simply have differing opinions in certain race cases, but that does not
mean that apic is always to blame, does it?

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