Date: Fri, 18 Jun 2004 04:41:32 -0300
From: Peter Cordes <peter@cordes.ca>
Subject: Re: x86-64: double timer interrupts in recent 2.4.x
In-reply-to: <20040617122645.5d1b5ec1.ak@suse.de>
To: Andi Kleen <ak@suse.de>
Cc: Mikael Pettersson <mikpe@csd.uu.se>, discuss@x86-64.org,
       linux-kernel@vger.kernel.org, len.brown@intel.com
Message-id: <20040618074132.GA17508@cordes.ca>
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On Thu, Jun 17, 2004 at 12:26:45PM +0200, Andi Kleen wrote:
> On Thu, 17 Jun 2004 10:54:00 +0200 (MEST)
> Mikael Pettersson <mikpe@csd.uu.se> wrote:
>=20
> > On Wed, 16 Jun 2004 16:28:26 -0300, Peter Cordes wrote:
> > > I just noticed that on my Opteron cluster, the nodes that are running=
 64bit
> > >kernels have their clocks ticking at double speed.  This happens with
> > >Linux 2.4.26, and 2.4.27-pre2
> >=20
> > I had the same problem: 2.4 x86-64 kernels ticking the clock
> > twice its normal speed, unless I booted with pci=3Dnoacpi.
> >=20
> > This got fixed very recently I believe, in a 2.4.27-pre kernel.
>=20
> In which one exactly? Most likely it was an ACPI problem/fix.
> Len, do you remember fixing such an issue?

 It's fixed in 2.4.27-pre3 and later.  Coincidentally or not, it was
released only 4 days after I mentioned the bug on debian-amd64 and
discuss@x86-64.  I'd narrow it down further, but kernel.org doesn't have -bk
patches for 2.4, and I don't know where to download more fine-grained patch
versions.

 (BTW, 2.4.27-pre6 doesn't compile without declaring=20
struct task_struct *tsk;  in rwsem-spinlock.c:__rwsem_wake_one_writer.)

 Thanks for the help.

--=20
#define X(x,y) x##y
Peter Cordes ;  e-mail: X(peter@cor , des.ca)

"The gods confound the man who first found out how to distinguish the hours!
 Confound him, too, who in this place set up a sundial, to cut and hack
 my day so wretchedly into small pieces!" -- Plautus, 200 BC

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