On Sunday 16 April 2006 20:41, Wolfgang Hoffmann wrote:
> Now with speedstep enabled and CONFIG_HIGH_RES_TIMERS=y, I see some
> anomalies:
> - time-of-day lags gradually behind wallclock time
It turns out that this is a non-issue. I can't quite explain how I came to the
impression that there is a clock lag, but current status is that the clock
runs correctly. So sorry for the noise.
On Tuesday 18 April 2006 00:35, Lee Revell wrote:
> 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.
Thanks for the pointer, Lee. I'm now running the clockfix CVS branch and the
problems are solved. So the -rt kernel is fine.
Thanks for the help,
Wolfgang
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