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From: Thomas Gleixner <tglx@linutronix.de>
To: Borislav Petkov <bp@amd64.org>
Cc: Markus Trippelsdorf <markus@trippelsdorf.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
Date: Fri, 29 Oct 2010 19:34:35 +0200 (CEST)	[thread overview]
Message-ID: <alpine.LFD.2.00.1010291932090.2692@localhost6.localdomain6> (raw)
In-Reply-To: <20101029170040.GJ21125@aftab>

Boris,

On Fri, 29 Oct 2010, 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.

can you please check with your hardware folks? If we can't get some
affirmative info about that then we'd be forced to revert that commit
(if it turns out to be the culprit one). That'd be a pity as it would
bring back the full IO access penalty to everyone.

Thanks,

	tglx

  parent reply	other threads:[~2010-10-29 17:35 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-26 11:20 Clocksource tsc unstable (delta = -8589361717 ns) in current git Markus Trippelsdorf
2010-10-26 13:18 ` Borislav Petkov
2010-10-26 13:58   ` Markus Trippelsdorf
2010-10-26 14:05     ` Markus Trippelsdorf
2010-10-26 14:38     ` Peter Zijlstra
2010-10-26 15:46       ` Thomas Gleixner
2010-10-26 16:41         ` Borislav Petkov
2010-10-26 15:48     ` Thomas Gleixner
2010-10-26 17:56       ` Markus Trippelsdorf
2010-10-26 18:19         ` Borislav Petkov
2010-10-26 19:18       ` john stultz
2010-10-27 14:26         ` Markus Trippelsdorf
2010-10-27 18:26           ` [bisected] Clocksource tsc unstable git markus
2010-10-27 19:36             ` Peter Zijlstra
2010-10-27 19:42               ` Markus Trippelsdorf
2010-10-27 19:58               ` Marcelo Tosatti
2010-11-09 12:58               ` Heiko Carstens
2010-11-09 13:07                 ` Markus Trippelsdorf
2010-11-09 13:21                 ` Markus Trippelsdorf
2010-11-09 13:28                   ` Heiko Carstens
2010-11-09 13:45                   ` Peter Zijlstra
2010-11-09 13:33                 ` Peter Zijlstra
2010-10-29  8:18             ` Borislav Petkov
2010-10-29  8:30               ` Markus Trippelsdorf
2010-10-29 10:27                 ` Borislav Petkov
2010-10-29 11:34                   ` Markus Trippelsdorf
2010-10-29 11:39                     ` Borislav Petkov
2010-10-29 11:54                       ` Markus Trippelsdorf
2010-10-29 13:13                         ` Borislav Petkov
2010-10-29 12:14                   ` Thomas Gleixner
2010-10-29 17:00                     ` Borislav Petkov
2010-10-29 17:26                       ` Markus Trippelsdorf
2010-11-01 18:05                         ` Thomas Gleixner
2010-11-01 18:45                           ` Markus Trippelsdorf
2010-11-02 15:26                             ` Thomas Gleixner
2010-11-05 16:09                               ` Borislav Petkov
2010-11-05 16:42                                 ` Markus Trippelsdorf
2010-11-05 17:45                                   ` Markus Trippelsdorf
2010-11-05 21:27                                   ` Markus Trippelsdorf
2010-11-05 21:32                                     ` Borislav Petkov
2010-11-09 14:02                                       ` Thomas Gleixner
2010-11-09 14:39                                         ` Borislav Petkov
2010-11-17 23:21                                           ` Markus Trippelsdorf
2010-11-24 11:25                                             ` Borislav Petkov
2010-10-29 17:34                       ` Thomas Gleixner [this message]
2010-10-27  3:24     ` Clocksource tsc unstable (delta = -8589361717 ns) in current git Mike Galbraith

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