From: Clark Williams <williams@redhat.com>
To: Max Miller <mxmr@gmx.net>
Cc: linux-rt-users@vger.kernel.org
Subject: Re: Tweak Latency on Intel ATOM
Date: Wed, 10 Feb 2010 16:38:18 -0600 [thread overview]
Message-ID: <20100210163818.7f54ec3a@torg> (raw)
In-Reply-To: <loom.20100209T081421-234@post.gmane.org>
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On Tue, 9 Feb 2010 07:41:58 +0000 (UTC)
Max Miller <mxmr@gmx.net> wrote:
> Hello,
>
> im am using the PREEMPT-RT patch on linux 2.6.29.6. It runs on a MSI965GSE
> industial board with Intel ATOM CPU (N270, 1,6GHz) and i945GSE Northbridge.
>
> I got about 45µs as maximum and 13µs as average latency when hyperthreading is
> disabled. With enabled Hyperthreading the maximum latency increses to about
> 100µs. I measured the latency with cyclictest.
>
> What can i do to get better maximum latency? Can I do somthing in the kernel
> configuration or are there some kernel bootoptions? Or is it still impossible
> with this CPU to get better results?
>
> Thanks in advance,
> Max Miller
>
>
Make sure you turn off any power management settings in the BIOS and
turn off the irqbalance and cpuspeed services on the Linux side.
What cyclictest command are you using to measure latency?
Clark
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next prev parent reply other threads:[~2010-02-10 22:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-09 7:41 Tweak Latency on Intel ATOM Max Miller
2010-02-10 22:38 ` Clark Williams [this message]
2010-02-11 7:54 ` Max Müller
2010-02-11 15:34 ` Clark Williams
2010-02-15 9:32 ` Max Müller
2010-02-15 14:38 ` Clark Williams
2010-02-16 6:50 ` Max Müller
2010-02-16 12:18 ` Luis Claudio R. Goncalves
2010-02-17 6:26 ` Max Müller
2010-02-12 20:54 ` mapping of PCI memory to user space not working with uio.c ? Armin Steinhoff
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