From: Peter Williams <pwil3058@bigpond.net.au>
To: Lee Revell <rlrevell@joe-job.com>
Cc: vatsa@in.ibm.com, linux-kernel@vger.kernel.org,
arjan@infradead.org, s0348365@sms.ed.ac.uk, kernel@kolivas.org,
tytso@mit.edu, cfriesen@nortel.com, trenn@suse.de,
george@mvista.com, johnstul@us.ibm.com, akpm@osdl.org
Subject: Re: [PATCH 1/3] Updated dynamic tick patches - Fix lost tick calculation in timer_pm.c
Date: Sat, 03 Sep 2005 14:18:43 +1000 [thread overview]
Message-ID: <43192423.2040400@bigpond.net.au> (raw)
In-Reply-To: <1125720301.4991.41.camel@mindpipe>
Lee Revell wrote:
> On Wed, 2005-08-31 at 22:42 +0530, Srivatsa Vaddagiri wrote:
>
>>With this patch, time had kept up really well on one particular
>>machine (Intel 4way Pentium 3 box) overnight, while
>>on another newer machine (Intel 4way Xeon with HT) it didnt do so
>>well (time sped up after 3 or 4 hours). Hence I consider this
>>particular patch will need more review/work.
>>
>
>
> Are lost ticks really that common? If so, any idea what's disabling
> interrupts for so long (or if it's a hardware issue)? And if not, it
> seems like you'd need an artificial way to simulate lost ticks in order
> to test this stuff.
In my experience, turning off DMA for IDE disks is a pretty good way to
generate lost ticks :-)
Peter
--
Peter Williams pwil3058@bigpond.net.au
"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
next prev parent reply other threads:[~2005-09-03 4:18 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-31 16:58 Updated dynamic tick patches Srivatsa Vaddagiri
2005-08-31 17:12 ` [PATCH 1/3] Updated dynamic tick patches - Fix lost tick calculation in timer_pm.c Srivatsa Vaddagiri
2005-08-31 22:36 ` Zachary Amsden
2005-08-31 22:47 ` john stultz
2005-09-02 15:43 ` [PATCH 1/3] dynticks - implement no idle hz for x86 Con Kolivas
2005-09-02 15:45 ` [PATCH 2/3] dyntick - Fix lost tick calculation in timer pm.c Con Kolivas
2005-09-02 15:46 ` [PATCH 3/3] dyntick - Recover walltime upon wakeup Con Kolivas
2005-09-02 17:25 ` [PATCH 2/3] dyntick - Fix lost tick calculation in timer pm.c Srivatsa Vaddagiri
2005-09-02 20:18 ` Thomas Schlichter
2005-09-02 21:21 ` john stultz
2005-09-02 16:56 ` [PATCH 1/3] dynticks - implement no idle hz for x86 Russell King
2005-09-02 17:12 ` Srivatsa Vaddagiri
2005-09-03 6:13 ` Con Kolivas
2005-09-03 7:58 ` Russell King
2005-09-03 8:01 ` Con Kolivas
2005-09-03 8:06 ` Russell King
2005-09-03 8:14 ` Con Kolivas
2005-09-04 20:10 ` Nishanth Aravamudan
2005-09-04 20:26 ` Russell King
2005-09-04 20:37 ` Nishanth Aravamudan
2005-09-04 21:17 ` Russell King
2005-09-05 3:08 ` Con Kolivas
2005-09-05 16:28 ` Nishanth Aravamudan
2005-09-05 6:58 ` Tony Lindgren
2005-09-05 16:30 ` Nishanth Aravamudan
2005-09-04 20:41 ` Nishanth Aravamudan
2005-09-05 5:32 ` Srivatsa Vaddagiri
2005-09-05 5:48 ` Nishanth Aravamudan
2005-09-05 6:32 ` Srivatsa Vaddagiri
2005-09-05 6:44 ` Nishanth Aravamudan
2005-09-06 20:51 ` Nishanth Aravamudan
2005-09-07 8:13 ` Tony Lindgren
2005-09-07 15:00 ` Nishanth Aravamudan
2005-09-07 15:53 ` Nishanth Aravamudan
2005-09-07 17:07 ` Srivatsa Vaddagiri
2005-09-07 17:23 ` Nishanth Aravamudan
2005-09-07 18:14 ` Srivatsa Vaddagiri
2005-09-07 18:22 ` Nishanth Aravamudan
2005-09-07 16:14 ` Bill Davidsen
2005-09-07 16:42 ` Nish Aravamudan
2005-09-07 17:17 ` Srivatsa Vaddagiri
2005-09-07 17:27 ` Nish Aravamudan
2005-09-07 18:18 ` Srivatsa Vaddagiri
2005-09-07 18:33 ` Nish Aravamudan
2005-09-09 16:27 ` Bill Davidsen
2005-09-05 7:37 ` Russell King
2005-09-05 7:49 ` Srivatsa Vaddagiri
2005-09-05 8:00 ` Russell King
2005-09-05 16:33 ` Nishanth Aravamudan
2005-09-05 7:00 ` Srivatsa Vaddagiri
2005-09-05 7:27 ` Tony Lindgren
2005-09-05 17:02 ` Nishanth Aravamudan
2005-09-07 7:37 ` Tony Lindgren
2005-09-07 15:05 ` Nishanth Aravamudan
2005-09-08 10:00 ` Tony Lindgren
2005-09-08 21:22 ` Nishanth Aravamudan
2005-09-08 22:08 ` Nishanth Aravamudan
2005-09-09 22:30 ` Nishanth Aravamudan
2005-09-20 11:06 ` Srivatsa Vaddagiri
2005-09-20 14:58 ` Nishanth Aravamudan
2005-09-22 13:38 ` Martin Schwidefsky
2005-09-22 14:52 ` Nishanth Aravamudan
2005-09-22 18:32 ` Srivatsa Vaddagiri
2005-09-26 15:08 ` Srivatsa Vaddagiri
2005-09-23 6:55 ` Srivatsa Vaddagiri
2005-09-05 7:44 ` Russell King
2005-09-05 8:19 ` Srivatsa Vaddagiri
2005-09-05 8:32 ` Russell King
2005-09-05 9:24 ` Srivatsa Vaddagiri
2005-09-05 17:06 ` Nishanth Aravamudan
2005-09-05 17:04 ` Nishanth Aravamudan
2005-09-05 17:27 ` Srivatsa Vaddagiri
2005-09-05 18:06 ` Nishanth Aravamudan
2005-09-05 13:19 ` Srivatsa Vaddagiri
2005-09-05 16:57 ` Nishanth Aravamudan
2005-09-05 17:25 ` Srivatsa Vaddagiri
2005-09-05 18:11 ` Nishanth Aravamudan
2005-09-03 4:05 ` [PATCH 1/3] Updated dynamic tick patches - Fix lost tick calculation in timer_pm.c Lee Revell
2005-09-03 4:18 ` Peter Williams [this message]
2005-09-03 4:34 ` Lee Revell
2005-09-03 4:48 ` Peter Williams
2005-09-03 5:15 ` Parag Warudkar
2005-09-03 5:30 ` Lee Revell
2005-09-03 5:20 ` Srivatsa Vaddagiri
2005-09-06 10:32 ` Pavel Machek
2005-09-06 10:46 ` Srivatsa Vaddagiri
2005-09-06 18:04 ` john stultz
2005-08-31 17:26 ` [PATCH 2/3] Updated dynamic tick patches - Cleanup Srivatsa Vaddagiri
2005-08-31 17:27 ` [PATCH 3/3] Updated dynamic tick patches - Recover walltime upon wakeup Srivatsa Vaddagiri
2005-09-01 5:23 ` Updated dynamic tick patches Con Kolivas
2005-09-01 13:07 ` Tony Lindgren
2005-09-01 13:19 ` David Weinehall
2005-09-01 13:46 ` Tony Lindgren
2005-09-01 14:11 ` Srivatsa Vaddagiri
2005-09-02 17:34 ` Srivatsa Vaddagiri
2005-09-03 10:16 ` Tony Lindgren
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