[Ffmpeg-devel] [PATCH] fix mpeg4 lowres chroma bug and increase h264/mpeg4 MC speed

[Michael Niedermayer]

Hi

On Mon, Feb 12, 2007 at 12:49:30PM +0100, Michael Niedermayer wrote:
[...]
> > 
> > > > Why do you discard some times in your TIMER code?  Is the goal just to
> > > > discard those times in which an interrupt occured?
> > >
> > > yes
> > 
> > That's not what's is doing, there are far too many skips for that to
> > be the case.
> 
> indeed ill try to improve START/STOP_TIMER

the new code will never skip if the code needed <2000 cycles,
interrupts on the 2 systems i tested need >5000 cycles so thats
a slight improvment, all other things ive tried failed (that was
reading and comparing /proc/interrupts (reading this itself causes
interrupts (about 10000 per second ...))
comparing clock() or related functions only catch 10% of the intrrupts
comparing getrusage() still catches only 50% of the interrupts

if anyone has any ideas how we could detect if a interrupt/task switch
happened between START and STOP_TIMER please tell me ...

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The educated differ from the uneducated as much as the living from the
dead. -- Aristotle 
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