Messages in this thread | | | Subject | Re: [PATCH] Staircase scheduler v7.4 | From | Felipe Alfaro Solana <> | Date | Mon, 28 Jun 2004 19:11:45 +0200 |
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On Mon, 2004-06-28 at 22:11 +1000, Con Kolivas wrote:
> The design of staircase would make renicing normal interactive things > - -ve values bad for the latency of other nice 0 tasks s is not > recommended for X or games etc. Initial scheduling latency is very > dependent on nice value in staircase. If you set a cpu hog to nice -5 it > will hurt audio at nice 0 and so on. Nicing latency unimportant things > with +ve values is more useful with this design. If you run X and > evolution at the same nice value they will get equal cpu share for > example so moving windows means redrawing evolution and X moving get > equal cpu. Nicing evolution +ve will make X smoother compared to > evolution redrawing and so on...
OK, just a few thoughts...
1. Both -mm3 and -np2 suffer from delays when redrawing "damaged" windows (windows which were covered and now are being exposed): while moving heavily a window over the screen, "damaged" windows are not redrawn. I would say this is a sign of starvation. However, this does not happen with -ck3 that is able to redraw "damaged' windows even while heavily moving a window all over the screen.
I can see this by looking at some icons that are lying on my desktop. With -mm3 and -np2, they are hardly redrawn while heavily moving a window all around. With -ck3, I can see the icons and their respective labels all the time.
2. Both -mm3 and -np2 show a very smooth behavior when moving windows all around the screen. However, -ck3 is somewhat a little bit jerky. I think this is a consequence of point number 1.
3. Both -mm3 and -ck3 are inmune to CPU hogs when mantaining interactivity: running "while true; do a=2; done" doesn't seem to affect the interactive behavior of them. I check this by running this CPU hog and hovering my mouse over KXDocker, which is a nice applet for KDE similar to the Mac OS X docker. KXDocker is another CPU hog by itself, but plays nicely with the "while true" loop. However, -np2 seems to suffer a little bit from starvation, as KXDocker animations don't feel smooth.
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