From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Martin Shepherd <mcs@domain.hid>
Cc: xenomai-help <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] Lockups on a new Celeron-430 system detected and resolved.
Date: Tue, 28 Apr 2009 08:44:03 +0200 [thread overview]
Message-ID: <49F6A5B3.1060909@domain.hid> (raw)
In-Reply-To: <Pine.LNX.4.64.0904272323360.11293@domain.hid>
Martin Shepherd wrote:
> On Tue, 28 Apr 2009, Gilles Chanteperdrix wrote:
>>> ...
>> On my side, disabling NO_HZ is enough to make the issue disappear. So, I
>> am back to my first observation: it looks like a bad interaction between
>> the I-pipe and the NO_HZ code. And it happens when Linux timing is based
>> on another timer than the intercepted local APIC timer.
>
> Given these two alternative ways of working around this problem, do
> you recommend disabling NO_HZ, or disabling the two timers? I don't
> have a clear picture of how these two options affect Xenomai,
> particularly in the case of code that has to periodically swap between
> the Xenomai and linux domains.
I would recommend disabling NO_HZ, I think it is mostly useless for a
real-time system. Having separated timer handling for Xenomai and Linux
should result in improved performance. Though I am not so sure.
--
Gilles.
next prev parent reply other threads:[~2009-04-28 6:44 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-23 9:20 [Xenomai-help] adeos patch 2.6.28.9-x86-2.2-07 feedback vikesh rambaran
2009-04-23 9:37 ` Philippe Gerum
2009-04-23 9:42 ` Philippe Gerum
2009-04-23 10:30 ` Vikesh Rambaran
2009-04-23 11:48 ` Philippe Gerum
2009-04-27 22:30 ` [Xenomai-help] Lockups on a new Celeron-430 system detected and resolved Martin Shepherd
2009-04-27 23:32 ` Gilles Chanteperdrix
2009-04-27 23:51 ` Gilles Chanteperdrix
2009-04-28 0:26 ` Martin Shepherd
2009-04-28 5:17 ` Gilles Chanteperdrix
2009-04-28 6:38 ` Martin Shepherd
2009-04-28 6:44 ` Gilles Chanteperdrix [this message]
2009-04-28 6:50 ` Martin Shepherd
2009-04-29 19:48 ` Martin Shepherd
2009-04-29 20:45 ` Philippe Gerum
2009-04-29 20:48 ` Philippe Gerum
2009-05-19 10:08 ` Philippe Gerum
2009-05-21 0:51 ` Martin Shepherd
2009-05-21 4:18 ` Thomas Lockhart
2009-05-24 21:52 ` Martin Shepherd
2009-04-23 12:01 ` [Xenomai-help] adeos patch 2.6.28.9-x86-2.2-07 feedback Gilles Chanteperdrix
2009-04-23 13:34 ` Vikesh Rambaran
2009-04-23 13:42 ` Gilles Chanteperdrix
2009-04-25 10:53 ` Vikesh Rambaran
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