Charles:
On 18/01/2010, at 4:20 PM, Charles wrote:
> Any chance you could pass the clockevents patch on to Matthieu to include in
> his patchset? HRT would help lots of users, I think, even without the -rt
> support.
No promises, but I could try to do that if anyone else shows an interest. :-)
Are Matthieu's patches hosted anywhere except in the Yahoo file area? Can he
(or someone) tell me what the status wrt the linux mainline is? I'm not a
kernel hacker, but I surmise that RT got merged sometime around 2.6.31, and
there seem to be have been a steady stream of ts72xx/ep93xx patches going in.
The 2.6.29.6 kernel I built does sub-10ms delays, dare I say even sub-100ns
delays using clock_nanosleep, but the RT scheduler (FIFO/highest priority) is
not keeping up its part of the bargain: running top glitches the multiplexed
display scanning loop. This loop is only twiddling some GPIO lines in the
manner of Jim Jackson's ts_arm_util (i.e. reading and writing to the mmap'd
GPIO addresses) - I can't make it much tighter. The CPU load due to my program
is something like 0.01% all up.
I'll try to look into it sometime soon.
cheers
peter
--
http://peteg.org/
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