From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: George Broz <GBroz@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] milli-second overruns under heavy load on x86, running Xenomai 2.5.6
Date: Fri, 26 Aug 2011 23:18:05 +0200 [thread overview]
Message-ID: <4E580D8D.80002@domain.hid> (raw)
In-Reply-To: <OF2D9ACDF1.2A655563-ON882578F8.0070CB81-882578F8.007235BA@moog.com>
On 08/26/2011 10:42 PM, George Broz wrote:
> Hello,
>
> I'm experiencing very large overruns in the neighborhood of 10 to 50
> *milli-seconds* as reported by the Xenomai latency tool in user-task mode
> whenever the Linux OS is heavily loaded. Under lighter loads these are in
> the 30 to 70 micro-second (normal) range.
>
> My system is:
> - Linux 2.6.37.6 (32-bit), Ubuntu 10.10 distribution
> - Xenomai 2.5.6 using I-pipe patch adeos-ipipe-2.6.37.6-x86-2.9-02
> - Intel x86 Atom (dual-core) CPU D510 @ 1.66GHz
> - Emb. dev board from Intel (ICH8M ctrlr, Ethernet h/w for e1000e)
> - Xenomai configured w&w/o --enable-smp --enable-x86-tsc options
> - gcc version 4.4.5
>
> I've followed all of the recommendations for kernel configuration and have
> disabled CPU sleep features in the BIOS such as SpeedStep and C-States.
> Legacy USB has been disabled in the BIOS. Hyperthreading has also been
> disabled, although I don't think it matters.
Have you tried to enable the SMI workaround?
--
Gilles.
next prev parent reply other threads:[~2011-08-26 21:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-26 20:42 [Xenomai-help] milli-second overruns under heavy load on x86, running Xenomai 2.5.6 George Broz
2011-08-26 21:18 ` Gilles Chanteperdrix [this message]
2011-08-26 21:49 ` George Broz
2011-08-29 7:13 ` Gilles Chanteperdrix
2011-08-30 2:45 ` George Broz
2011-08-29 10:18 ` Jan Kiszka
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