Messages in this thread | | | Date | Tue, 04 Nov 2003 13:32:58 +1100 | From | Nick Piggin <> | Subject | Re: Responsiveness of 2.6.0-Test9 |
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Erwin Telser wrote:
>>Erwin Telser wrote: >> >>>Are there things to observe when switching from 2.4 to 2.6, if I want the >>>same responsiveness? I'm asking because I' ve made the following >>>observation. (I always had the feeling, 2.4 seems to faster, but this is >>>the first time it' s very obvious) >>> >>>I' ve connected two monitors on a Matrox G550. One runs with DRI the other >>>one doesn't (not possible with the current driver). The Monitor with DRI >>>I'm using as a TV Set, watching movies with xawtv. (With a bttv 878 tuner >>>card). >>> >>>Now with the 2.4.22 kernel (preemptible patch aplied) I can play the >>>little game kbounce on the other monitor, without to notice any slowdown, >>>no matter, whether xawtv is running or not. >>> >>>But with the 2.6 Kernel (compiled with preemptible option) the bouncing >>>balls slow down considerably, as soon as I move the mouse. >>> >>>I know the whole thing is a little foolish. But anyway, are there some >>>tricks to get the same responsiveness? >>> >>Hi, >>Your report is not foolish at all ;) >>Please make sure your X process is at default static priority, 0. >>Report back if you are still having problems. What sort of processor >>do you have? Is your 2.6 video driver running with the same sort of >>acceleration as your 2.4 one (do you get the same frame rate in glxgears)? >> > >I installed X from scratch and didn't edit any start script. so I assume, that >it runs with priority 0. The processor is an Intel P4 2000MHz in an ASUS >P4B266 Board. If I compare the frames per second with glxgears there is a >slight advantage for 2.4 >
renice 0 `pidof X`
> >2.4: >with DRI 358 - 364 >without DRI 181 - 198 > >2.6 >with DRI 350 - 362 >without DRI 180 - 187 > >An even better way to show the differenze between 2.4 and 2.6 is to change the >size of the xawtv window. If I do that, the slowdown is quite significant. >But it happens only with xawtv. If I do the same with konqueror or MPlayer, >nothing happens. A very strange thing are the values I get from ksysguard > >Kernel 2.4, glxgears >user load: 3% - 4% >system load: 95% >IRQ per second: ~100 > >Kernel 2.6, glxgears >user load: 15% >system load: 85% >IRQ per second: ~1100 > >Kernel 2.4, xawtv >user load: 2% >system load: 0% >IRQ per second: ~100 > >Kernel 2.6, xawtv >user load: 9% >system load: 0% >IRQ per second: ~1060 > >Kernel 2.4, MPlayer >user load: 35% >system load: 2% >IRQ per second: ~1170 > >Kernel 2.6, MPlayer >user load: 42% >system load: 2% >IRQ per second: ~2130 > >Something is causing a high IRQ load with kernel 2.6. Probably an APIC >problem? >
It is the timer interrupt. Now happens 1000 per second instead of 100. This might just be the reason why you are seeing a different balance, the collection of cpu statistics is more precise.
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