On Wed, 2007-09-12 at 09:29 -0700, Jesse Barnes wrote: > On Wednesday, September 12, 2007, Randy Dunlap wrote: > > On Wed, 12 Sep 2007 08:33:15 -0700 Jesse Barnes wrote: > > > I just narrowed down a weird problem where I was losing more than > > > 50% of my vblank interrupts to what seems to be the hires timers > > > patch. Stock 2.6.23-rc5 works fine, but the latest (171) kernel > > > from rawhide drops most of my interrupts unless I also have another > > > interrupt source running (e.g. if I hold down a key or move the > > > mouse I get the expected number of vblank interrupts, otherwise I > > > get between 3 and 30 instead of the expected 60 per second). > > > > > > Any ideas? It seems like it might be bad APIC programming, but I > > > haven't gone through those mods to look for suspects... > > > > Also tickless? (NO_HZ ?) > > > > I think I've seen some emails about tickless and keystrokes being > > needed to cause interrupts... but I'm not postive about it.
That's a suspend / resume problem which we are hunting. > > but you said "any ideas" > > Yeah, there's NO_HZ in the rawhide kernel too, but I'm getting timer > ticks normally afaict, it's just vblank interrupts that get lost... Jesse, does it make any difference when you boot the box with: nohz=off on the kernel command line ? tglx - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/