Re: [Fwd: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4]

Lee Revell
2004-10-29T19:52:48Z

On Fri, 2004-10-29 at 10:02 +0200, Ingo Molnar wrote:
> I know that Jackd does alot of precautions
> to avoid unintentional scheduling (mlockall, the use of SCHED_FIFO),
> but are you absolutely sure it doesnt happen? This scenario could be
> excluded by measuring the time Jackd calls poll(), and comparing it
> to the expected value. [Or is this value already included in the
> stats Rui collected? Maybe the "Maximum Process Cycle" value?]

Yes, this is already accounted for in the 'Maximum Process Cycle' value.
This measures the time between returning from poll() and entering it
again. I will try to add some instrumentation to jackd and test this
weekend. I do agree that it could be a jackd bug; this would not be the
first time the VP patches exposed bugs in other apps.

Lee