Re: Crash with fs corruption on 2.4.23-rc1 + CONFIG_ACPI_PROCESSOR

[Ducrot Bruno <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org>]

On Mon, Nov 17, 2003 at 10:31:36AM -0800, Nate Lawson wrote:
> On Mon, 17 Nov 2003, Ducrot Bruno wrote:
> > On Sat, Nov 15, 2003 at 02:48:11PM +0100, Stelian Pop wrote:
> > > On Sat, Nov 15, 2003 at 07:50:20AM +0100, Ducrot Bruno wrote:
> > >
> > > > I think the trouble come from C3, just need to check some values.  If you
> > > > can, it may be usefull that you disable C3, with something like that:
> > > >
> > > > +		acpi_fadt.plvl3_lat = 1234;
> > >
> > > And the patch works, your assumption was correct.
> > >
> > > Now, C3 seem to be reported as supported, 2.6 (correctly) doesn't
> > > promote to it, but 2.4 does. I can't find an obvious reason by reading
> > > the processor.c code (almost identical between 2.4/2.6...)
> >
> > No, 2.6 have some trouble, I guess, because C3 should be promoted.  I guess
> > you are using a USB bridge driver, which need to be rewrotten somehow, because
> > it does a lot of DMA transfers just to check if a device is plugged..
> > That affect all USB driver, but not EHCI IIRC.
> 
> BTW, you were right about USB causing huge numbers of BM events.  Without
> it in my kernel, things are quiet and C3 is used.  I just committed the
> driver (FreeBSD).  Playing mp3s also results in BM activity but that is
> expected.  I plan to add a quiesce method to our USB drivers so that ACPI
> can shut the polling off while idle.
> 

Well, easy to guess: each time C3 is problematic under Linux show that
it's either:
1/ USB bridge (need to be fixed in the usb driver, not acpi related imo),
2/ PIIX4 F-DMA errata deadlock is enabled (that is: C3 have to be disabled).
3/ PIIX4 ide workaround check is enabled.

1/ still need to be fixed.
2/ and 3/ have been fixed by Dominik Brodowski last year.

The trouble for Stelian seems to be different, though (and therefore more
interresting).


-- 
Ducrot Bruno

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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