From: Matthias Fuchs <mfuchs@ma-fu.de>
To: pavel@pavlinux.ru, Tim Sander <tim@krieglstein.org>
Cc: linux-rt-users <linux-rt-users@vger.kernel.org>
Subject: Re: 3.12.6-rt9 on AM335x (armv7)
Date: Wed, 08 Jan 2014 09:08:52 +0100 [thread overview]
Message-ID: <52CD0794.8030009@ma-fu.de> (raw)
In-Reply-To: <52CC91E9.7070808@pavlinux.ru>
Hmm, on Intel it might be an SMI-Issue.
Matthias
On 08.01.2014 00:46, Pavel Vasilyev wrote:
> 08.01.2014 02:58, Tim Sander пишет:
>
>> Yeah 118 µs should be the right ballpark, while still a little high for my
>> taste. All cortex a8 seem to have rather high latency. The A9's seem much
>> better in this respect.
>
> On my Intel Atom D425, latency around 25-30 µs (but peaks upto 5000 µs :/ )
>
>>
>> Have you seen the following:
>> https://www.osadl.org/Realtime-Preempt-Kernel.kernel-rt.0.html#latencyfighting
>>
>> Cyclictest has tracing support which might help finding the cause of the long
>> latency.
>>
>
>
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next prev parent reply other threads:[~2014-01-08 8:08 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-01 16:37 3.12.6-rt9 on AM335x (armv7) Matthias Fuchs
2014-01-06 19:48 ` Matthias Fuchs
2014-01-07 8:38 ` Tim Sander
2014-01-07 21:20 ` Matthias Fuchs
2014-01-07 22:58 ` Tim Sander
2014-01-07 23:46 ` Pavel Vasilyev
2014-01-08 8:08 ` Matthias Fuchs [this message]
2014-01-08 8:06 ` Matthias Fuchs
2014-02-07 16:07 ` Sebastian Andrzej Siewior
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