On Sun, 14 Jun 2009, Pallipadi, Venkatesh wrote: > >On Sun, 14 Jun 2009, Benjamin S. wrote: > > > >This is odd as well: > >> CPU0 CPU1 > >> 0: 42 1 IO-APIC-edge timer > >> 24: 4830 0 HPET_MSI-edge hpet2 > >> LOC: 42 5070 Local timer interrupts > > > >So we set up only one hpet channel for CPU0 and CPU1 uses the local > >timer interrupt. Need to look at that as well. > > > > Logic in percpu HPET is something like this. > > - Number of per cpu HPET channels = total number of HPET channels - > 1 (global HPET) - 1 (legacy RTC replacement) - 1 (reserved for > /dev/hpet). > > - So, this number is assigned one per CPU and remaining CPUs use > APIC timer + broadcast logic > > Looks like there is a slight problem with the above though. We > should start such per cpu assignment from CPU 1 instead of CPU 0, > when number of HPET channels is less than number of CPUs. Will send > a patch for that. But, this suspend resume problem should not be due > to the percpu HPET logic. It will be good to try with hpet=disable > to make sure... Benjamin just confirmed that. The logic in disable_device_interrupts() already skips interrupts marked with IRQF_TIMER, but I suspect that the hpet/MSI interupts are not marked that way. Thanks, tglx _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
