From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753232Ab0KEV16 (ORCPT <rfc822;w@1wt.eu>);
	Fri, 5 Nov 2010 17:27:58 -0400
Received: from smtp-out-084.synserver.de ([212.40.180.84]:1053 "HELO
	smtp-out-086.synserver.de" rhost-flags-OK-OK-OK-FAIL)
	by vger.kernel.org with SMTP id S1752300Ab0KEV14 (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Fri, 5 Nov 2010 17:27:56 -0400
X-SynServer-TrustedSrc: 1
X-SynServer-AuthUser: markus@trippelsdorf.de
X-SynServer-PPID: 21998
Date: Fri, 5 Nov 2010 22:27:49 +0100
From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: Borislav Petkov <bp@amd64.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, Borislav Petkov <bp@alien8.de>,
        john stultz <johnstul@us.ibm.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "hpa@linux.intel.com" <hpa@linux.intel.com>,
        Ingo Molnar <mingo@elte.hu>,
        "Herrmann3, Andreas" <Andreas.Herrmann3@amd.com>,
        "heiko.carstens@de.ibm.com" <heiko.carstens@de.ibm.com>,
        "a.p.zijlstra@chello.nl" <a.p.zijlstra@chello.nl>,
        "avi@redhat.com" <avi@redhat.com>,
        "mtosatti@redhat.com" <mtosatti@redhat.com>
Subject: Re: [bisected] Clocksource tsc unstable git
Message-ID: <20101105212749.GA1559@arch.trippelsdorf.de>
References: <20101029083013.GA1553@arch.trippelsdorf.de>
 <20101029102713.GA21125@aftab>
 <alpine.LFD.2.00.1010291411150.2692@localhost6.localdomain6>
 <20101029170040.GJ21125@aftab>
 <20101029172631.GA23546@arch.trippelsdorf.de>
 <alpine.LFD.2.00.1011011904280.2566@localhost6.localdomain6>
 <20101101184512.GA1589@arch.trippelsdorf.de>
 <alpine.LFD.2.00.1011021626160.9357@localhost6.localdomain6>
 <20101105160919.GC25704@aftab>
 <20101105164225.GA1594@arch.trippelsdorf.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20101105164225.GA1594@arch.trippelsdorf.de>
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, Nov 05, 2010 at 05:42:25PM +0100, Markus Trippelsdorf wrote:
> On Fri, Nov 05, 2010 at 05:09:19PM +0100, Borislav Petkov wrote:
> > On Tue, Nov 02, 2010 at 11:26:54AM -0400, Thomas Gleixner wrote:
> > > Ok, I'm waiting for Boris to get us the confirmation from HW folks.
> > 
> > However, we don't know (yet) whether this can be used in the
> > non-periodic mode too. My gut feeling says yes but I wouldn't trust it.
> > 
> > We went and collected that value a bunch of systems and it looks like it
> > would need more massaging (read: capping) since some BIOSen simply write
> > crap in it. It ranges from
> > 
> > - 0x37ee on old nVidia and Intel boards (this is definitely crap, I
> > can't imagine a minimum ticks value of 14318 for a HPET but who knows)
> > 
> > - 0x1000 on a HP machine (also fishy)
> > 
> > - 0x10, 0x14 on current SBxxx boards
> > 
> > - 0x80 on newer Intel boards
> 
> "min tick: 20" on my machine. Given that 12 is running stable here, maybe
> the value is a bit too large?

Err, 20==0x14 so it's not that much difference and it's running fine here
also.

Feel free to add:
    Reported-and-tested-by: Markus Trippelsdorf <markus@trippelsdorf.de>

Thanks.

-- 
Markus