On Sun, 2006-04-16 at 20:41 +0200, Wolfgang Hoffmann wrote:
> - if CPU frequency is low when jackd is started, it complains:
> "delay of 2915.000 usecs exceeds estimated spare
> time of 2847.000; restart ..."
> as soon as frequency is scaled up. Seems that jackd gets confused by some
> influence of CPU frequency on timekeeping? No problems as long as CPU
> frequency isn't scaled up, though.
JACK still uses the TSC for timing and thus is incompatible with CPU
frequency scaling. You must use the -clockfix branch from CVS.
> - values in /proc/sys/kernel/preempt_max_latency scales inverse to
> CPU frequency, i.e. 24us with CPU @ 800MHz and 12us with CPU @ 1,6GHz
This is normal - code that takes 12us to run at 1.6 GHz will take 24us
at 800MHz. TANSTAAFL ;-)
Lee
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