[linux-audio-dev] POSIX clocks now in linux 2.5

[Fons Adriaensen]

Paul Davis writes:
 > the kernel gives non-SCHED_FIFO/RR threads roughly 1/HZ
 > resolution.

Seems to be 20 ms on my unpatched standard SuSE 2.4.19.
I imagine this can be lowered by modifying the kernel config ?

 > SCHED_FIFO/RR threads can get better than that if the
 > delay is very small, but its implemented by spinning on the
 > processor.

Yes, in my first test I used something like 150 microseconds,
and the machine froze for 15 seconds (100000 iterations).

 > the new code will provide usec resolution without spinning. it
 > reprograms the APIC timer to interrupt the CPU at the right time. i
 > believe that you will still need capabilities, euid=0 and/or
 > SCHED_FIFO/RR to use it fully.

No problem with that.
TNX for the info.

-- 
FA