From: Pavel Vasilyev <pavel@pavlinux.ru>
To: Tim Sander <tim@krieglstein.org>, Matthias Fuchs <mfuchs@ma-fu.de>
Cc: linux-rt-users <linux-rt-users@vger.kernel.org>
Subject: Re: 3.12.6-rt9 on AM335x (armv7)
Date: Wed, 08 Jan 2014 03:46:49 +0400 [thread overview]
Message-ID: <52CC91E9.7070808@pavlinux.ru> (raw)
In-Reply-To: <10785809.PZUZGWPMgY@hydra>
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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.
>
--
Pavel.
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next prev parent reply other threads:[~2014-01-07 23:47 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 [this message]
2014-01-08 8:08 ` Matthias Fuchs
2014-01-08 8:06 ` Matthias Fuchs
2014-02-07 16:07 ` Sebastian Andrzej Siewior
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