From: Alistair John Strachan <s0348365@sms.ed.ac.uk>
To: Lee Revell <rlrevell@joe-job.com>
Subject: Re: athlon 64 dual core tsc out of sync
Date: Sat, 4 Feb 2006 19:52:40 +0000
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Cc: Ed Sweetman <safemode@comcast.net>, linux-kernel@vger.kernel.org
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On Saturday 04 February 2006 19:03, Lee Revell wrote:
> On Fri, 2006-02-03 at 21:10 -0500, Ed Sweetman wrote:
> > I know this has been gone over before, and I am aware of the possible
> > fix being the use of the pmtmr.
> >
> > My question is, if there is support builtin to the kernel for more than
> > one timer, and we know that no timer but the pmtimer is reliable on a
> > dual core system, why doesn't the startup of the kernel choose the
> > pmtimer based on if it detects the system is a dual core proc with smp
> > enabled?   And if the pmtimer doesn't fix this sync issue, is there a
> > fix out there?   Currently with 2.6.16-rc1-mm5 the non-customized boot
> > args to the kernel results in these messages.
>
> Excellent question.  What's the status of this bug?  It's a showstopper
> for a ton of people on the JACK list...

As Andi has recounted many times already, pmtmr is now the default on x86-64 
if it's built in. I'm sure you can confirm this from the sources.

[alistair] 19:52 [~] uname -a
Linux damocles 2.6.15.1 #5 SMP PREEMPT Wed Feb 1 09:43:23 GMT 2006 x86_64 
x86_64 x86_64 GNU/Linux

[alistair] 19:52 [~] dmesg | egrep -e time.c.*PM
time.c: Using 3.579545 MHz PM timer.
time.c: Using PM based timekeeping.

-- 
Cheers,
Alistair.

'No sense being pessimistic, it probably wouldn't work anyway.'
Third year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
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