From: Tony Lindgren <tony@atomide.com>
To: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Cc: Tony Lindgren <tony@atomide.com>,
Con Kolivas <kernel@kolivas.org>,
linux-kernel@vger.kernel.org, arjan@infradead.org,
s0348365@sms.ed.ac.uk, tytso@mit.edu, cfriesen@nortel.com,
rlrevell@joe-job.com, trenn@suse.de, george@mvista.com,
johnstul@us.ibm.com, akpm@osdl.org
Subject: Re: Updated dynamic tick patches
Date: Sat, 3 Sep 2005 03:16:09 -0700 [thread overview]
Message-ID: <20050903101609.GB5181@muru.com> (raw)
In-Reply-To: <20050902173432.GA5029@in.ibm.com>
On Fri, Sep 02, 2005 at 11:04:32PM +0530, Srivatsa Vaddagiri wrote:
> On Thu, Sep 01, 2005 at 04:07:22PM +0300, Tony Lindgren wrote:
> > Srivatsa, could you try the dyntick-test.c on your system after booting
> > to init=/bin/sh to make the system as idle as possible?
>
> Tony,
> I get this o/p when I run your test on my SMP system with
> 2.6.13-mm1 + Con's latest patches (including the most recent
> lost tick calculation patch that I posted after that).
...
>
> Don't see any ERROR status. The negative latencies doesn't seem to sound
> good. Do you see them too? I ran your test on my RH9 based T30 and
> find several negative latencies there too.
Good, thanks for testing.
> Test: select 3000ms time: 3.000127s latency: 0.000127s status: OK
This is when I started seeing errors. Looks like if the next event from
next_timer_interrupt() is longer than HZ and idle HZ is very low, such
as 3 - 4 HZ, something gets confused.
I'll be looking into it more a bit later on, but until the problem
is solved, we should limit MAX_SKIP_TICKS to HZ/2.
Tony
next prev parent reply other threads:[~2005-09-03 10:16 UTC|newest]
Thread overview: 98+ 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
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 [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-08-31 18:49 Erik Andrén
2005-09-02 8:52 ` Srivatsa Vaddagiri
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