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

[Lee Revell]

On Fri, 2004-10-29 at 16:00 +0100, Rui Nuno Capela wrote:
> For example, in my own case, if those tests are done with ACPI disabled
> (yes, with acpi=off), this laptop of mine just skews the results
> completely: vanilla 2.6.9 gets better results, while the RT ones go
> slumber. Go figure ;)

I suspect that your laptop uses SMM traps to talk to the battery.  That
could certainly explain the 700 us xruns, because SMM disables all
interrupts.  This was covered recently in another thread.  According to
Alan Cox most laptops work this way.

Has anyone been able to reproduce the problem on a desktop system?

Lee

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