Messages in this thread | | | Date | Mon, 24 May 2004 16:58:29 +1000 | From | Nick Piggin <> | Subject | Re: tvtime and the Linux 2.6 scheduler |
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Ingo Molnar wrote: > * Con Kolivas <kernel@kolivas.org> wrote: > > >>> 33 ms : time per NTSC frame >> >>snip >> >>The followup email from someone describing good performance may help >>us understand what's going on. Your example of poor performance is one >>when the cpu performance is marginal to get exactly 30 fps processed >>and on the screen. The cpu overhead in 2.6 is slightly higher than 2.4 >>so a borderline case may be just pushed over. > > > most of the cpu overhead comes from HZ=1000. Especial with SCHED_FIFO > there should be minimal (if any) impact from the scheduler changes - > SCHED_FIFO tasks get all CPU time, no ifs and whens. > > could people who experience tvtime performance problems apply the patch > below to change HZ back to 100? Does it have any impact? >
Just one other thing - realtime scheduling was basically broken up until around 2.6.5. Before starting any tests, please ensure first that you are using at least the 2.6.5 kernel. Thanks. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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