Re: [ck] [PATCH] dynamic-tick patch modified for SMP

Srivatsa Vaddagiri
2005-08-15T16:14:09Z

On Sun, Aug 14, 2005 at 10:18:28AM +1000, Con Kolivas wrote:
> timers that made no progress until interrupts drove the timers on again. I
> built in both PIT and APIC dyntick mode into the kernel and the default in
> the way I modified the patch is for APIC mode to be used if it's built in.
> After that I modified the values using the sysfs interface at
> /sys/devices/system/dyn_tick/dyn_tick0/. In APIC mode it seems to run close to

Con,
I am observing the reverse problem - my patch does not work in APIC
mode. I am thinking it has to do something with disabling PIT interrupts.

Have you enabled CONFIG_DYN_TICK_USE_APIC in my patch? What does
/sys/.../dyn_tick0/state show when my patch is working (in APIC mode for you)?
Can you disable CONFIG_DYN_TICK_USE_APIC with my patch and check if it
works? Also can you send me 'dmesg | grep APIC' (want to know if your
hardware has local APIC that is enabled by the kernel).

--

Thanks and Regards,
Srivatsa Vaddagiri,
Linux Technology Center,
IBM Software Labs,
Bangalore, INDIA - 560017