From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Mark Saiia <mark.saiia@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] fpu context switch issue
Date: Tue, 11 Nov 2008 23:39:44 +0100 [thread overview]
Message-ID: <491A09B0.2080703@domain.hid> (raw)
In-Reply-To: <67b6b3430811111432o1ca14e87w7ccab4ab95dd591e@domain.hid>
Mark Saiia wrote:
> I applied the patch to Xenomai-2.4.5 with kernel 2.6.26.3 and observed the
> erroneous behavior. I did the same with linux-2.6.27.5 and Xenomai r4372
> and noticed the same behavior. Please let me know if I can run additional
> tests, if you need any more information, or how to potentially fix this
> issue.
So, fninit is not the culprit. What could happen is that we do not
really get an FPU fault upon first access to the FPU. To know this, we
should test the state of the ts bit before the first use of FPU in each
thread.
I will send a patch to do this.
--
Gilles.
next prev parent reply other threads:[~2008-11-11 22:39 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-03 0:35 [Xenomai-help] fpu context switch issue Steven Seeger
2008-11-03 10:10 ` Gilles Chanteperdrix
2008-11-03 14:21 ` Steven Seeger
2008-11-03 17:04 ` Gilles Chanteperdrix
2008-11-03 20:37 ` Mark Saiia
2008-11-04 8:30 ` Gilles Chanteperdrix
2008-11-08 16:56 ` Gilles Chanteperdrix
2008-11-11 0:07 ` Mark Saiia
2008-11-11 11:21 ` Gilles Chanteperdrix
2008-11-11 17:43 ` Steven Seeger
2008-11-11 22:32 ` Mark Saiia
2008-11-11 22:39 ` Gilles Chanteperdrix [this message]
2008-11-13 11:11 ` Gilles Chanteperdrix
2008-11-14 3:59 ` Mark Saiia
2008-11-14 8:42 ` Gilles Chanteperdrix
2008-11-17 17:27 ` Mark Saiia
2008-11-17 18:54 ` Steven Seeger
2008-11-19 18:51 ` Steven Seeger
2008-11-20 12:43 ` Gilles Chanteperdrix
2008-11-20 13:51 ` Steven Seeger
2008-11-21 17:03 ` Mark Saiia
2008-11-21 17:07 ` Gilles Chanteperdrix
2008-11-26 10:47 ` Gilles Chanteperdrix
2008-11-12 13:48 ` Steven Seeger
2008-11-12 13:52 ` Gilles Chanteperdrix
2008-11-12 13:53 ` Steven Seeger
2008-11-04 9:55 ` Gilles Chanteperdrix
2008-11-04 15:38 ` Steven Seeger
2008-11-04 17:29 ` Mark Saiia
2008-11-04 18:59 ` Gilles Chanteperdrix
2008-11-04 19:01 ` Gilles Chanteperdrix
2008-11-04 21:29 ` Steven Seeger
2008-11-05 17:47 ` Mark Saiia
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