Messages in this thread | ![/](/images/icornerl.gif) | | From | Roger Larsson <> | Subject | Re: 2.6: More about interactivity | Date | Thu, 7 Aug 2003 21:08:45 +0200 |
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On Thursday 07 August 2003 20.15, Felipe Alfaro Solana wrote: > Just wanted to throw a few thoughts I have about the current scheduler > and my experiences with it (well, with my specific workloads and > applications on my little 700 Mhz PIII laptop). > > I feel that 2.6.0-test2-mm5 is not as smooth as 2.6.0-test2-mm2 (O10int) > was. I am experiencing sound skips, but this time I'm not using XMMS, > but Juk, a KDE player which uses the aRTS sound daemon, which in turn, I > assume it uses the OSS API.
Arts uses whatever you have - i think ALSA is preferred.
> > With X reniced at +0, the system feels not as smooth as 2.6.0-test2-mm2, > but at least there are no sound skips. However, to gain on smoothness, I > have chosen to renice X to -20. Renicing X to -20 makes Juk skip like > crazy simply by dragging a window over the screen. Also, with X at -20, > opening a long Bookmarks Konqueror menu also causes sound skips (even > with XMMS). By now, I'm sticking at +0, but I really miss those times > when I was running O10int and the desktop was as smooth as silk.
Wait a minute!
Arts (I think JuK only tells Arts what to play) is a realtime task - if it does not meet its deadline you get drop outs. X is not a realtime task (unless you display video using it - is X even involved in video/3D?).
But you run X at a higher priority than Arts!? Don't you? You have told the scheduler that X is more important than Arts - and you are surpriced that you get dropouts?
Arts should really run as SCHED_FIFO or SCHED_RR but that opens another can of worms - audio plugins can busy lock the computer... We need SCHED_SOFTRR now!
But you can try to prioritize arts higher than X (arts at -20, X at -15). Or set suid root on artswrapper to get SCHED_FIFO, and then enable realtime scheduling in configuration.
/RogerL
-- Roger Larsson Skellefteå Sweden - 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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