Messages in this thread | | | Date | Thu, 25 Nov 2004 17:08:48 +0100 (MET) | From | Esben Nielsen <> | Subject | Re: Priority Inheritance Test (Real-Time Preemption) |
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On Thu, 25 Nov 2004, Ingo Molnar wrote:
> [...] > there's one thing i noticed, now that the blocker device is in the > kernel, you have to be really careful to compile the userspace loop() > code via the same gcc flags as the kernel did. Minor differences in > compiler options can skew the timing calibration. > > but any such bug should at most cause a linear deviation via a constant > factor multiplication, while the data shows a systematic nonlinear > transformation. > -g -Wall -O2 was on in userspace.
> [...] > yeah, i agree that this has to be further investigated. What type of box > did you test it on - UP or SMP? (SMP scheduling of RT tasks only got > fully correct in the very latest -31-7 kernel.) > UP, PIII 697.143 Mhz
> Ingo >
Esben
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