Re: athlon x2 + 2.6.14 + SMP = fast clock

Akira Tsukamoto
2005-11-20T18:12:06Z

On Tue, 08 Nov 2005 14:59:25 -0800
john stultz <johnstul@us.ibm.com> mentioned:
> On Tue, 2005-11-08 at 20:02 -0500, Christopher Mulcahy wrote:
> > On Tue, 2005-11-08 at 13:38 -0800, john stultz wrote:
> > > On Tue, 2005-11-08 at 15:40 -0500, Christopher Mulcahy wrote:
> > > > I am running 2.6.14 SMP on an dual-core athlon x2 3800.
> > > > The system clock runs at roughly twice normal speed.
> > >
> > > Is this a new regression or did the problem occur with 2.6.13 or older
> > > kernels?
> > This is a new-machine.
> > The only other kernel it has seen is the distro-install-kernel ( 2.6.12
> > uni-processor (ubuntu-5.10) ) ( this kernel does not have a problem,
> > but it is not SMP )
> >
> > I will try to find time to build 2.4.13 and 2.4.12 SMP kernels with the
> > ~same config to see if they have the same problem. ( I presume I could
> > then attach these findings to the original bugzilla report? )
>
> There are a few similar sounding bugs out there:
> If its an ATI chipset, check out
> http://bugzilla.kernel.org/show_bug.cgi?id=3927
>
> If its an nvidia chipset, check out
> http://bugzilla.kernel.org/show_bug.cgi?id=3341

My machine's clock runs about 2X from normal speed.
Could you try my patch which I just posted a hour ago?
http://marc.theaimsgroup.com/?l=linux-kernel&m=113249769027262&w=2

The patch will detect whether IO-APCI timer interupt is generated too fast
and try to use a legacy i8259A IRQ instead.

It might help. It also worked on 2.4.31 kernel for me.

>
>
> > > Would you mind opening a kernel bug and attaching your dmesg and config?
> > >
> > > http://bugzilla.kernel.org
> > >
> > will do.
>
> Please tag me as the owner when you do.
>
> > >
> > > Also try booting w/ "idle=poll" to see if that doesn't clear up the
> > > issue.
> > >
> > Tried that without results.
>
> Bummer. Your box may not boot, but trying noapic might help as well.
>
> thanks
> -john
>
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--
Akira Tsukamoto <akira-t@suna-asobi.com, at541@columbia.edu>