CONFIG_NO_HZ is set and so the kernel should be OK - but there are other options you might want to set, PowerTOP suggests the most important ones. I think you might be running a userspace program or using a driver that causes your CPU to go to C3 only for 1 ms. Using a quite recent kernel is always a good idea because existing drivers usually get better - using new drivers sometimes is not a good idea, because they may be buggy.
Many binary drivers (nVidia, ATI) are badly maintained and can cause problems as well, but there is not much one could do about it... So tweak your kernel config according to PowerTOPs tipps if you haven't done, otherwise you should be fine. Peter On Sun, 2007-05-27 at 12:21 +0200, Antoine Caillau wrote: > Peter, is my kernel configuration ok ? Or should I set some others > options to no ? > > Best regards, > > Antoine > > On 27/05/07, Peter Ganzhorn < [EMAIL PROTECTED]> wrote: > Why don't you use 2.6.21? > With the tickless timers came a lot of problems which were > fixed in the > 2.6.21-rc* kernels. However, there are patches for kernel > version prior > to 2.6.21, so if you really cannot upgrade to 2.6.21 for some > reason, > you may want to try a patch for 2.6.20 from > http://www.tglx.de/projects/hrtimers/2.6.20/ . The name > tickless was > introduced with 2.6.21, with this patch it's called dyntick - > technically it's the same thing. On top of that you get high > resolution > timers, both were introduced in 2.6.21 together and developed > together > before. Using high resolution timers with tickless is > recommended AFAIK, > but I don't know too much about this. > > But as I said, prior to 2.6.21 this was kind of buggy and may > result in > kernel panics, freezes, ... > > Peter > > > On Sun, 2007-05-27 at 12:04 +0200, Yuan Chao wrote: > > On 5/27/07, Peter Ganzhorn <[EMAIL PROTECTED]> > wrote: > > > > > You have to check if 'CONFIG_NO_HZ' is set to Y. > > > Important: If you are using a kernel older than 2.6.21 > this feature > > Is there any patch back port to older version kernel, say > 2.6.20? > > > > > > _______________________________________________ > Power mailing list > [email protected] > http://www.bughost.org/mailman/listinfo/power > _______________________________________________ Power mailing list [email protected] http://www.bughost.org/mailman/listinfo/power
