Re: Random 3 to 4.5 second blocks of RT thread

[Stanislav Meduna <stano@meduna.org>]

On 11.02.2013 16:54, Ralf Müller wrote:

> It basically is a loop that wakes up every milli second, increments a
> generation counter, does some statistics and goes to sleep for
> another millisecond.

3-4.5 seconds is heavy so this is not very probable, but seeing
that you have a thread with prio 99 and have timer wakeup
problems, depending on what the other realtime threads do maybe
the following could be (part of) the issue:

http://www.spinics.net/lists/linux-rt-users/msg08745.html
http://www.spinics.net/lists/linux-rt-users/msg07804.html

Shortly said: you aren't going to have low latency timers
if the ksoftirqd can be preempted by your threads.

Disclaimer: I have never used RT with 2.6, so I don't know
whether it applies at all.

Regards
-- 
                                         Stano

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