From: Andi Kleen <ak@suse.de>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>,
tglx@linutronix.de, john stultz <johnstul@us.ibm.com>,
LKML <linux-kernel@vger.kernel.org>, Len Brown <lenb@kernel.org>,
Roman Zippel <zippel@linux-m68k.org>
Subject: Re: [patch 13/19] GTOD: Mark TSC unusable for highres timers
Date: Fri, 10 Nov 2006 11:47:25 +0100 [thread overview]
Message-ID: <200611101147.26081.ak@suse.de> (raw)
In-Reply-To: <1163154958.3138.671.camel@laptopd505.fenrus.org>
On Friday 10 November 2006 11:35, Arjan van de Ven wrote:
>
> > We're limping along in a semi-OK fashion with the TSC.
>
> that's because we fake it a heck of a lot; like after C3 we just make
> the kernel guestimate how much to progress it so that it has just enough
> ductape on it to not totally fall apart ;(
Do we? Where? AFAIK we just do some resetting after cpu frequency
changes, but on C3 TSC is just disabled globally.
That is better than it sounds.
Most systems don't have C3 right now. And on those that have
(laptops) it tends to be not that critical because they normally
don't run workload where gettimeofday() is really time critical
(and nobody expects them to be particularly fast anyways)
[... proposal for per CPU TSC state snipped ...]
All is being worked on.
-Andi
next prev parent reply other threads:[~2006-11-10 10:47 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-09 23:38 [patch 00/21] Highres / dynticks drop in replacement for 2.6.19-rc5-mm1 Thomas Gleixner
2006-11-09 23:38 ` [patch 01/19] hrtimers: state tracking Thomas Gleixner
2006-11-10 9:19 ` Arjan van de Ven
2006-11-10 9:40 ` Andrew Morton
2006-11-10 9:45 ` Thomas Gleixner
2006-11-23 22:26 ` Roman Zippel
2006-11-09 23:38 ` [patch 02/19] hrtimers: clean up callback tracking Thomas Gleixner
2006-11-10 9:20 ` Arjan van de Ven
2006-11-09 23:38 ` [patch 03/19] hrtimers: Move and add documentation Thomas Gleixner
2006-11-09 23:38 ` [patch 04/19] Add a framework to manage clock event devices Thomas Gleixner
2006-11-10 9:47 ` Arjan van de Ven
2006-11-23 22:36 ` Roman Zippel
2006-11-09 23:38 ` [patch 05/19] ACPI: Include apic.h Thomas Gleixner
2006-11-09 23:38 ` [patch 06/19] ACPI: Keep track of timer broadcast Thomas Gleixner
2006-11-10 9:51 ` Arjan van de Ven
2006-11-09 23:38 ` [patch 07/19] ACPI: Add state propagation for dynamic broadcasting Thomas Gleixner
2006-11-10 9:52 ` Arjan van de Ven
2006-11-09 23:38 ` [patch 08/19] i386: cleanup apic code Thomas Gleixner
2006-11-10 10:04 ` Arjan van de Ven
2006-11-10 10:16 ` Thomas Gleixner
2006-11-10 10:16 ` Arjan van de Ven
2006-11-09 23:38 ` [patch 09/19] i386: Convert to clock event devices Thomas Gleixner
2006-11-10 10:10 ` Arjan van de Ven
2006-11-09 23:38 ` [patch 10/19] PM_timer: allow early access and move externs to a header file Thomas Gleixner
2006-11-10 10:12 ` Arjan van de Ven
2006-11-09 23:38 ` [patch 11/19] i386: Rework local APIC calibration Thomas Gleixner
2006-11-10 10:17 ` Arjan van de Ven
2006-11-10 10:23 ` Thomas Gleixner
2006-11-10 11:10 ` Ingo Molnar
2006-11-09 23:38 ` [patch 12/19] high-res timers: core Thomas Gleixner
2006-11-10 10:26 ` Arjan van de Ven
2006-11-09 23:38 ` [patch 13/19] GTOD: Mark TSC unusable for highres timers Thomas Gleixner
2006-11-10 1:10 ` john stultz
2006-11-10 5:10 ` Andi Kleen
2006-11-10 8:10 ` Thomas Gleixner
2006-11-10 8:50 ` Andrew Morton
2006-11-10 8:57 ` Ingo Molnar
2006-11-10 9:13 ` Andrew Morton
2006-11-10 9:29 ` Andi Kleen
2006-11-11 11:14 ` Thomas Gleixner
2006-11-11 13:51 ` Andi Kleen
2006-11-11 13:58 ` Thomas Gleixner
2006-11-11 13:59 ` Andi Kleen
2006-11-11 14:08 ` Thomas Gleixner
2006-11-10 10:35 ` Arjan van de Ven
2006-11-10 10:47 ` Andi Kleen [this message]
2006-11-10 10:55 ` Arjan van de Ven
2006-11-10 11:13 ` Ingo Molnar
2006-11-10 11:28 ` Andi Kleen
2006-11-10 9:27 ` Andi Kleen
2006-11-10 10:14 ` Alan Cox
2006-11-10 11:19 ` Ingo Molnar
2006-11-10 15:43 ` Chris Friesen
2006-11-10 11:12 ` Pavel Machek
2006-11-10 11:48 ` Ingo Molnar
2006-11-10 11:56 ` Andi Kleen
2006-11-10 13:12 ` Ingo Molnar
2006-11-10 12:00 ` Pavel Machek
2006-11-10 13:14 ` Ingo Molnar
2006-11-10 11:11 ` Pavel Machek
2006-11-10 10:28 ` Arjan van de Ven
2006-11-10 10:30 ` Andi Kleen
2006-11-10 10:37 ` Arjan van de Ven
2006-11-09 23:38 ` [patch 14/19] dynticks: core code Thomas Gleixner
2006-11-09 23:38 ` [patch 15/19] dyntick: add nohz stats to /proc/stat Thomas Gleixner
2006-11-09 23:38 ` [patch 16/19] dynticks: i386 arch code Thomas Gleixner
2006-11-09 23:38 ` [patch 17/19] dynticks: Fix nmi watchdog Thomas Gleixner
2006-11-09 23:38 ` [patch 18/19] high-res timers, dynticks: enable i386 support Thomas Gleixner
2006-11-09 23:38 ` [patch 19/19] debugging feature: timer stats Thomas Gleixner
2006-11-23 22:24 ` [patch 00/21] Highres / dynticks drop in replacement for 2.6.19-rc5-mm1 Roman Zippel
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