Messages in this thread | | | Subject | RE: Possible CPU_IDLE bug [WAS: Re: Timer unstability on when using C2 and deeper sleep states (Dell Latitude XT)] | From | Milan Plzik <> | Date | Thu, 14 Aug 2008 15:28:27 +0200 |
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On Št, 2008-08-14 at 13:40 +0200, Milan Plzik wrote: > On Št, 2008-08-14 at 11:00 +0200, Thomas Gleixner wrote: > > On Thu, 14 Aug 2008, Milan Plzik wrote: > > > I tried it just now, is performs a bit better than 2.6.26 (e.g. I > > > don't get that "press any key unless nothing happens" states), even > > > reports a bit more reasonable values of wakeups, but the system > > > sometimes becomes rather slow (e.g. when playing video). I was not able > > > to compile fglrx driver, so I had to change it to radeon one. And also, > > > the number of wakeups reported is not very convincing, though, it > > > changes from 300 to 600 (which is ~ two times the sum of wakeups) > > > without any reason, and sometimes goes even higher. > > > > > > I tried to use nolapic_timer option, but it didn't help. > > > > Can you please try "hpet=disable" on the kernel command line ? > > Looks like this has helped; after cold reboot hpet=disable seems to > help the system to run properly (on 2.6.26 kernel). I wonder what could > cause these problems. In the meanwhile I learned that this machine > doesn't do proper cleanup during reboot -- it seems that state before > reboot affects the state after reboot, so I should probably do some > re-testing with cold reboot after each attempt. I guess I tried > hpet=disable some time ago and after quick reboot it did not work > properly.
UPDATE: looks like it doesn't help always. I cold-booted twice, once hpet=disable didn't help and the timing was messed up, the other time it seemed to work just correctly. Maybe it's some race condition during startup, but I was not able to find any substantial difference in kernel messages emitted during boot, (just little changes like 2401.86 BogoMIPS processor vs. 2401.88 and similar).
> > > > > Thanks, > > tglx > > Thank you, > Milan
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