From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: edward.robbins@domain.hid
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] Very high latencies under stress testing
Date: Mon, 16 Aug 2010 14:32:03 +0200 [thread overview]
Message-ID: <4C692FC3.5040802@domain.hid> (raw)
In-Reply-To: <1281960823.030215299@domain.hid>
edward.robbins@domain.hid wrote:
>
> On Friday, 13 August, 2010 3:35pm, "Gilles Chanteperdrix" <gilles.chanteperdrix@xenomai.org> said:
>
>> edward.robbins@domain.hid wrote:
>>> I wonder if this is to do with graphics? I have set "NoAccel" in the
>>> driver section of Xorg.conf (I am using fbdev). I also notice that
>>> latencies go massive (e.g. 4200uS) the first time I run glxgears.
>>> "glxinfo" reports "Direct rendering: no".
>> This is bad news. It could come either from the fact that the Xorg
>> driver shuts hardware interrupts off (there is nothing xenomai can do
>> about that), or it could be an SMI issue. What about using the driver
>> for the real graphic card you have ? Probably intel card? Do you observe
>> any big latencies if you stress the system with anything else than X?
>>
>>> Power management options (ACPUI, APM): Disable ACPI (Advanced
>>> Configuration and Power Interface) Support --> Processor Disable CPU
>>> Frequency Scaling Disable CPU idle PM support Disable Power Managment
>>> Support
>> Disabling ACPI is a bad idea. As repeated many times, only
>> ACPI_PROCESSOR should be disabled, not ACPI.
>>
>
> Thanks for your helpful responses.
>
> I'm not working on this project again until next week, but on Friday I was able to
>
> o Recompile the kernel with ACPI enabled
> o Boot with the 'SMI handler' BIOS option set to disabled....
> according to the help text this option should be disabled if 'an RTOS
> is installed' - I presume this means that SMIs are completely disabled
> and therefore SMIs cannot be the source of the problem
> (very convenient BIOS option... now I begin to appreciate the expense of this board!)
> o Changed xorg to use the intel video driver
Now you can try NoAccel with the intel video driver too....
--
Gilles.
next prev parent reply other threads:[~2010-08-16 12:32 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-13 14:17 [Xenomai-help] Very high latencies under stress testing edward.robbins
2010-08-13 14:35 ` Gilles Chanteperdrix
2010-08-16 12:13 ` edward.robbins
2010-08-16 12:32 ` Gilles Chanteperdrix [this message]
2010-09-03 16:30 ` edward.robbins
2010-09-04 8:51 ` Philippe Gerum
2010-10-15 9:21 ` edward.robbins
2010-10-15 11:54 ` edward.robbins
2010-10-15 13:51 ` Gilles Chanteperdrix
2010-10-15 14:13 ` edward.robbins
2010-10-15 14:25 ` Gilles Chanteperdrix
2010-10-15 14:33 ` Philippe Gerum
2010-10-19 13:52 ` edward.robbins
2010-10-19 20:01 ` Gilles Chanteperdrix
2010-10-23 11:08 ` edward.robbins
2010-10-23 11:13 ` Gilles Chanteperdrix
2010-10-23 11:22 ` edward.robbins
2010-10-23 11:36 ` Gilles Chanteperdrix
2010-10-23 13:45 ` edward.robbins
2010-10-23 13:51 ` Gilles Chanteperdrix
2010-10-23 13:56 ` edward.robbins
2010-10-23 13:58 ` Gilles Chanteperdrix
2010-10-23 14:32 ` edward.robbins
2010-10-23 14:37 ` Gilles Chanteperdrix
2010-10-23 14:48 ` edward.robbins
2010-10-23 15:16 ` edward.robbins
2010-10-23 14:10 ` Gilles Chanteperdrix
2010-08-13 14:40 ` Philippe Gerum
2010-08-13 16:15 ` Philippe Gerum
-- strict thread matches above, loose matches on Subject: below --
2010-10-23 14:54 edward.robbins
2010-10-23 15:37 ` Gilles Chanteperdrix
2010-10-23 16:21 ` edward.robbins
2010-10-23 16:26 ` edward.robbins
2010-10-23 18:46 ` edward.robbins
2010-10-23 21:52 ` Gilles Chanteperdrix
2010-10-24 15:55 ` edward.robbins
2010-10-23 16:13 ` Gilles Chanteperdrix
2010-10-23 16:22 ` Gilles Chanteperdrix
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