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

[Lee Revell]

On Sat, 2004-10-30 at 13:16 +0200, Ingo Molnar wrote:
> * Lee Revell <rlrevell@xxxxxxxxxxx> wrote:
> 
> >   835 80000000 0.473ms (+0.000ms): finish_task_switch (__schedule)
> >   835 80000000 0.474ms (+0.000ms): trace_stop_sched_switched (finish_task_switch)
> >   835 80000000 0.474ms (+0.849ms): (835) ((49))
> >   835 80000000 1.324ms (+0.000ms): do_IRQ (finish_task_switch)
> >   835 80000000 1.324ms (+0.001ms): do_IRQ ((0))
> >   835 80000000 1.325ms (+0.002ms): mask_and_ack_8259A (__do_IRQ)
> 
> this seems to be very similar to the DMA problems Mark H Johnson had. It
> is almost certainly not caused by the kernel. It could in theory be some
> SMM overhead, but the bigger likelyhood is disk DMA.
> 

I find this hard to believe - I _never_ saw that problem on this system
before.  And it works _perfectly_ with T3 - I can run hundreds of
millions of process cycles without a single xrun.

Lee

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