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From: john stultz <johnstul@us.ibm.com>
To: Parag Warudkar <kernel-stuff@comcast.net>
Cc: Nishanth Aravamudan <nacc@us.ibm.com>, Andi Kleen <ak@suse.de>,
	lkml <linux-kernel@vger.kernel.org>,
	Tim Schmielau <tim@physik3.uni-rostock.de>,
	George Anzinger <george@mvista.com>,
	albert@users.sourceforge.net,
	Ulrich Windl <ulrich.windl@rz.uni-regensburg.de>,
	Christoph Lameter <clameter@sgi.com>,
	Dominik Brodowski <linux@dominikbrodowski.de>,
	David Mosberger <davidm@hpl.hp.com>,
	Andrew Morton <akpm@osdl.org>,
	paulus@samba.org, schwidefsky@de.ibm.com,
	keith maanthey <kmannth@us.ibm.com>,
	Chris McDermott <lcm@us.ibm.com>, Max Asbock <masbock@us.ibm.com>,
	mahuja@us.ibm.com, Darren Hart <darren@dvhart.com>,
	"Darrick J. Wong" <djwong@us.ibm.com>,
	Anton Blanchard <anton@samba.org>,
	donf@us.ibm.com, mpm@selenic.com, benh@kernel.crashing.org
Subject: Re: [PATCH 3/4] new timeofday x86-64 arch specific changes (v. B1)
Date: Thu, 02 Jun 2005 16:20:53 -0700	[thread overview]
Message-ID: <1117754453.17804.51.camel@cog.beaverton.ibm.com> (raw)
In-Reply-To: <200506021905.08274.kernel-stuff@comcast.net>

On Thu, 2005-06-02 at 19:05 -0400, Parag Warudkar wrote:
> On Thursday 02 June 2005 14:39, Nishanth Aravamudan wrote:
> > Which timesource is being used?
> >
> > cat /sys/devices/system/timesource/timesource0/timesource
> 
> tux-gentoo parag # cat /sys/devices/system/timesource/timesource0/timesource
> jiffies tsc tsc-interp *acpi_pm

You can change the timesource at runtime by doing something like:

echo "tsc" > /sys/devices/system/timesource/timesource0/timesource

The "*" denotes the current timesource, so you'll see it move the next
time you cat the timesource sysfs file.

Could you see if the slowness you're feeling is correlated to the
acpi_pm timesource? It is quite a bit slower to access then the TSC, but
I'd be surprised if you can actually feel the difference.

This is on an x86-64 system, correct?

thanks
-john




  reply	other threads:[~2005-06-02 23:25 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-06-02 18:27 Parag Warudkar
2005-06-02 18:39 ` Nishanth Aravamudan
2005-06-02 23:05   ` Parag Warudkar
2005-06-02 23:20     ` john stultz [this message]
2005-06-02 23:33       ` Parag Warudkar
2005-06-02 23:50       ` Parag Warudkar
2005-06-03  7:05         ` Ulrich Windl
2005-06-03 15:24         ` john stultz
2005-06-05 17:05           ` Dominik Brodowski
2005-06-06  3:04             ` Parag Warudkar
2005-06-06  3:14               ` Dominik Brodowski
2005-06-10  0:48               ` George Anzinger
2005-06-06  9:21             ` Andi Kleen
2005-06-06  9:24               ` Dominik Brodowski
2005-06-06  9:30                 ` Andi Kleen
2005-06-06 13:32               ` Vojtech Pavlik
2005-06-06 22:53             ` john stultz
2005-06-03 16:30         ` Andi Kleen
2005-06-03 18:27           ` john stultz
2005-06-03 19:02             ` Christoph Lameter
2005-06-03 19:21               ` john stultz
2005-06-05 11:27             ` Andi Kleen
2005-06-06 22:51               ` john stultz
2005-06-04 18:40           ` Parag Warudkar
2005-06-05 11:28             ` Andi Kleen
2005-06-05 14:15               ` Parag Warudkar
2005-06-05 20:51                 ` Lee Revell
2005-06-05 21:41                   ` Parag Warudkar
2005-06-05 22:13                     ` Lee Revell
2005-06-06  9:29                 ` Andi Kleen
2005-06-06 11:46                   ` Parag Warudkar
2005-06-08 13:51                     ` Andi Kleen
2005-06-09  1:47                       ` Lee Revell
2005-06-09  2:12                         ` john stultz
2005-06-09  2:42                           ` Parag Warudkar
2005-06-09 14:17                           ` Andi Kleen
2005-06-03 13:32       ` Parag Warudkar
2005-06-02 18:40 ` john stultz
  -- strict thread matches above, loose matches on Subject: below --
2005-06-02 18:51 Parag Warudkar
2005-06-01 23:09 [PATCH 1/4] new timeofday core subsystem " john stultz
2005-06-01 23:12 ` [PATCH 2/4] new timeofday i386 arch specific changes " john stultz
2005-06-01 23:13   ` [PATCH 3/4] new timeofday x86-64 " john stultz
2005-06-02  0:37     ` Parag Warudkar
2005-06-02 17:34       ` john stultz

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