linux-kernel - Re: [bisected] Clocksource tsc unstable git

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Message-ID: <alpine.LFD.2.00.1011021626160.9357@localhost6.localdomain6>
Date:	Tue, 2 Nov 2010 16:26:54 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
cc:	Borislav Petkov <bp@...64.org>, Borislav Petkov <bp@...en8.de>,
	john stultz <johnstul@...ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hpa@...ux.intel.com" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	"Herrmann3, Andreas" <Andreas.Herrmann3@....com>,
	"heiko.carstens@...ibm.com" <heiko.carstens@...ibm.com>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"avi@...hat.com" <avi@...hat.com>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>
Subject: Re: [bisected] Clocksource tsc unstable git

On Mon, 1 Nov 2010, Markus Trippelsdorf wrote:

> On Mon, Nov 01, 2010 at 07:05:17PM +0100, Thomas Gleixner wrote:
> > On Fri, 29 Oct 2010, Markus Trippelsdorf wrote:
> > > On Fri, Oct 29, 2010 at 07:00:40PM +0200, Borislav Petkov wrote:
> > > > So Markus, can you try with 995bd3bb5c78, but by increasing the value
> > > > to, say 16 (I don't know what's a good value here, let's double the old
> > > > one). Simply change the line
> > > > 
> > > > 	return res < 8 ? -ETIME : 0;
> > > > 
> > > > to
> > > > 
> > > > 	return res < 16 ? -ETIME : 0;
> > > > 
> > > > 
> > > > in <arch/x86/kernel/hpet.c:hpet_next_event()>. I'll do that too on the
> > > > machine here when I get around to it.
> > > 
> > > Yes, I already did this, although I'm running
> > > return res < 12 ? -ETIME : 0; 
> > > at the moment.
> > 
> > Any update on this ?
> 
> Yes, it runs stable thus far. No "slowdowns", no problems.

Ok, I'm waiting for Boris to get us the confirmation from HW folks.

Thanks,

	tglx
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