From: George Anzinger <george@mvista.com>
To: Jesse Barnes <jbarnes@engr.sgi.com>
Cc: john stultz <johnstul@us.ibm.com>,
Christoph Lameter <clameter@sgi.com>,
Albert Cahalan <albert@users.sourceforge.net>,
lkml <linux-kernel@vger.kernel.org>,
tim@physik3.uni-rostock.de, Ulrich.Windl@rz.uni-regensburg.de,
Len Brown <len.brown@intel.com>,
linux@dominikbrodowski.de, David Mosberger <davidm@hpl.hp.com>,
Andi Kleen <ak@suse.de>,
paulus@samba.org, schwidefsky@de.ibm.com, jimix@us.ibm.com,
keith maanthey <kmannth@us.ibm.com>, greg kh <greg@kroah.com>,
Patricia Gaughen <gone@us.ibm.com>,
Chris McDermott <lcm@us.ibm.com>
Subject: Re: [RFC][PATCH] new timeofday core subsystem (v.A0)
Date: Thu, 09 Sep 2004 01:09:17 -0700 [thread overview]
Message-ID: <41400FAD.4050802@mvista.com> (raw)
In-Reply-To: <200409082337.30961.jbarnes@engr.sgi.com>
Jesse Barnes wrote:
> On Wednesday, September 8, 2004 9:31 pm, George Anzinger wrote:
>
>>a.) resolution. If you don't put a limit on this you will invite timer
>>storms. Currently, by useing 1/HZ resolution, all timer "line up" on ticks
>>and reduce the interrupt overhead that would occure if we actually tried to
>>give "exactly" what was asked for. This is a matter of math and can be
>>handled (assuming we resist the urge to go shopping :))
>
>
> This can be bad though if lots of CPUs hit it at the same time or nearly so if
> they're all trying to write the same cacheline or two.
I think that most of the SMP issues your talking about have gone away with 2.6
where we have seperate timer lists for each cpu.
--
George Anzinger george@mvista.com
High-res-timers: http://sourceforge.net/projects/high-res-timers/
Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml
next prev parent reply other threads:[~2004-09-09 8:13 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-02 21:07 [RFC] New Time of day proposal (updated 9/2/04) john stultz
2004-09-02 21:09 ` [RFC][PATCH] new timeofday core subsystem (v.A0) john stultz
2004-09-02 21:11 ` [RFC][PATCH] new timeofday i386 hooks (v.A0) john stultz
2004-09-02 21:12 ` [RFC][PATCH] new timeofday i386 timesources (v.A0) john stultz
2004-09-03 1:44 ` [RFC][PATCH] new timeofday i386 hooks (v.A0) George Anzinger
2004-09-03 2:06 ` john stultz
2004-09-03 8:07 ` Ulrich Windl
2004-09-03 18:09 ` George Anzinger
2004-09-02 22:19 ` [RFC][PATCH] new timeofday core subsystem (v.A0) Christoph Lameter
2004-09-02 22:28 ` john stultz
2004-09-02 22:42 ` Christoph Lameter
2004-09-02 23:14 ` john stultz
2004-09-02 23:39 ` Christoph Lameter
2004-09-03 0:07 ` john stultz
2004-09-03 0:47 ` Christoph Lameter
2004-09-03 1:30 ` john stultz
2004-09-03 7:43 ` George Anzinger
2004-09-03 19:32 ` john stultz
2004-09-03 16:18 ` Christoph Lameter
2004-09-03 21:00 ` john stultz
2004-09-03 22:04 ` Christoph Lameter
2004-09-03 23:00 ` john stultz
2004-09-04 0:11 ` Christoph Lameter
2004-09-03 1:39 ` George Anzinger
2004-09-03 1:58 ` john stultz
2004-09-03 6:42 ` Albert Cahalan
2004-09-03 7:24 ` George Anzinger
2004-09-03 19:27 ` john stultz
2004-09-03 22:10 ` George Anzinger
2004-09-03 23:32 ` john stultz
2004-09-04 0:02 ` George Anzinger
2004-09-08 18:07 ` john stultz
2004-09-09 0:08 ` George Anzinger
2004-09-09 0:51 ` john stultz
2004-09-09 3:14 ` Christoph Lameter
2004-09-09 3:32 ` john stultz
2004-09-09 4:31 ` George Anzinger
2004-09-09 6:37 ` Jesse Barnes
2004-09-09 8:09 ` George Anzinger [this message]
2004-09-09 19:07 ` john stultz
2004-09-09 20:49 ` George Anzinger
2004-09-13 21:29 ` Christoph Lameter
2004-09-13 22:25 ` john stultz
2004-09-13 22:45 ` Christoph Lameter
2004-09-14 6:53 ` Ulrich Windl
2004-09-14 17:49 ` Christoph Lameter
2004-09-15 0:57 ` George Anzinger
2004-09-15 3:32 ` Christoph Lameter
2004-09-15 8:04 ` George Anzinger
2004-09-15 8:54 ` Dominik Brodowski
2004-09-15 17:54 ` George Anzinger
2004-09-15 9:12 ` Andi Kleen
2004-09-15 15:46 ` Christoph Lameter
2004-09-15 18:00 ` George Anzinger
2004-09-15 18:28 ` Christoph Lameter
2004-09-15 6:46 ` Christoph Lameter
2004-09-15 16:32 ` john stultz
2004-09-15 16:46 ` Christoph Lameter
2004-09-15 17:13 ` john stultz
2004-09-15 17:30 ` Christoph Lameter
2004-09-15 18:48 ` john stultz
2004-09-15 19:58 ` George Anzinger
2004-09-15 20:20 ` Christoph Lameter
2004-09-16 7:02 ` Ulrich Windl
2004-09-03 19:18 ` john stultz
2004-09-02 22:09 ` [RFC] New Time of day proposal (updated 9/2/04) Christoph Lameter
2004-09-02 22:22 ` john stultz
2004-09-02 22:47 ` Christoph Lameter
2004-09-03 9:54 ` Dominik Brodowski
2004-09-03 19:41 ` john stultz
2004-09-03 20:26 ` Dominik Brodowski
2004-09-03 21:05 ` john stultz
2004-09-06 6:26 ` Ulrich Windl
2004-09-06 11:56 ` Alan Cox
2004-09-07 16:14 ` Christoph Lameter
2004-09-03 15:17 ` Andi Kleen
2004-09-03 20:11 ` john stultz
2004-09-04 13:00 ` Andi Kleen
2004-09-07 16:10 ` Christoph Lameter
2004-09-07 18:24 ` George Anzinger
2004-09-07 20:55 ` Christoph Lameter
2004-09-07 21:42 ` George Anzinger
2004-09-08 6:26 ` Ulrich Windl
2004-09-08 18:25 ` john stultz
[not found] <413850B9.15119.BA95FD@rkdvmks1.ngate.uni-regensburg.de>
[not found] ` <1094224071.431.7758.camel@cube>
2004-09-06 6:08 ` [RFC][PATCH] new timeofday core subsystem (v.A0) Ulrich Windl
2004-09-12 17:11 ` Albert Cahalan
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