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Date: Mon, 5 Mar 2007 08:49:29 +1100 From: Con Kolivas <kernel@...ivas.org> To: Al Boldi <a1426z@...ab.com>, ck list <ck@....kolivas.org> Cc: linux-kernel@...r.kernel.org Subject: Re: [ANNOUNCE] RSDL completely fair starvation free interactive cpu scheduler On Monday 05 March 2007 07:35, Al Boldi wrote: > Con Kolivas wrote: > > > >> >> >This message is to announce the first general public release of > > > >> >> > the "Rotating Staircase DeadLine" cpu scheduler. > > Thanks a lot! You're welcome. > > > Just to make it clear. The purpose of this scheduler is at all costs to > > maintain absolute fairness no matter what type of load it is put under. > > Great! > > > This means that if you heavily load up your machine without the use of > > 'nice' then your interactive tasks _will_ slow down proportionately to > > the amount of cpu you use. So doing make -j4 for example will make any > > other task started in taht presence run precisely 1/5th speed, but they > > will still be responsive, have low latency (and audio shouldn't skip for > > example). > > That's just what it did, but when you "nice make -j4", things (gears) start > to stutter. Is that due to the staircase? gears isn't an interactive task. Apart from using it as a background load to check for starvation because it loads up the cpu fully (which a gpu intensive but otherwise simple app like this should _not_ do) graphics card drivers and interrupts and so on, I wouldn't put much credence on gears as anything else. However I suspect that gears will still get a fair share of the cpu on RSDL which almost never happens on any other scheduler. P.S. Al, please don't drop ccs from the original thread. -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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