Hiya, I am switching email-client currently, so excuse a bit of chaos.
I am reading
https://rt.wiki.kernel.org/index.php/Frequently_Asked_Questions#What_sort_of_real-time_performance_should_I_expect.3F
I think it sounds really interesting that you have 10-30uS latencies
back in 2007. The concept sounds thorough and tried then. So I shouldn`t
expect any big SMI messing things up, on my core2duo right?
I think I really wanna get this to work. No solutions? :)
I am reading more here:
https://rt.wiki.kernel.org/index.php/CONFIG_PREEMPT_RT_Patch
"Works ok, but frequency scaling has to be turned off for decent
results. A task run at 1 kHz repetition rate with low load was found to
be t-distributed with 4 degrees of freedom, with 1% value 0.9842 ms, 99%
value 1.0103 ms (ideal realtime performance would get exactly 1 ms for
both values), with the frequency governor set to "performance"."
Quite low. So he has got it running with low jitter, on a core 2 quad.
SMI sounds not much of a problem then. I want this guys. Altough as said
I am buying a computer, particulary for low-jitter, we can always try
and make this work on my older box in the mean time.
Remember the prob is with threadirqs on mainline aswell. Could it be
some clockproblem? A task for the thirsty bughunter, and patch-glory to
mainline.
--
Fred være med deg / Peace Be with You,
Ove Karlsen
http://www.paradoxuncreated.com
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