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From: John Stultz <johnstul@us.ibm.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Paul Mackerras <paulus@samba.org>,
	Tony Luck <tony.luck@intel.com>, Ingo Molnar <mingo@elte.hu>,
	lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Close small window for vsyscall time inconsistencies
Date: Mon, 07 Apr 2008 09:32:42 -0700	[thread overview]
Message-ID: <1207585962.6138.4.camel@jstultz-laptop> (raw)
In-Reply-To: <874padsy5b.fsf@basil.nowhere.org>


On Mon, 2008-04-07 at 13:27 +0200, Andi Kleen wrote:
> john stultz <johnstul@us.ibm.com> writes:
> >
> > The update_vsyscall then runs, and updates the clocksource frequency
> > with a slower frequency.
> 
> In the new code TSC should be only used on fixed-pstate TSC systems
> (cpufreq always marks it unstable), so that cannot really happen.

Sorry for being confusing here. This is not about hardware (TSC or
other) frequency changes, but the modification of the software's
representation of the frequency (as done w/ NTP adjustments).

thanks
-john


      reply	other threads:[~2008-04-07 16:32 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-04-04 20:17 john stultz
2008-04-07  0:55 ` Roman Zippel
2008-04-07  6:27   ` Thomas Gleixner
2008-04-07 10:02     ` Roman Zippel
2008-04-07 11:29     ` Andi Kleen
2008-04-07 11:27 ` Andi Kleen
2008-04-07 16:32   ` John Stultz [this message]

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