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

[Lee Revell]

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


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