Re: [RFC][PATCH] new timeofday core subsystem (v.A0)

George Anzinger
2004-09-09T08:13:37Z

Jesse Barnes wrote:
> On Wednesday, September 8, 2004 9:31 pm, George Anzinger wrote:
>
>>a.) resolution. If you don't put a limit on this you will invite timer
>>storms. Currently, by useing 1/HZ resolution, all timer "line up" on ticks
>>and reduce the interrupt overhead that would occure if we actually tried to
>>give "exactly" what was asked for. This is a matter of math and can be
>>handled (assuming we resist the urge to go shopping :))
>
>
> This can be bad though if lots of CPUs hit it at the same time or nearly so if
> they're all trying to write the same cacheline or two.

I think that most of the SMP issues your talking about have gone away with 2.6
where we have seperate timer lists for each cpu.

--
George Anzinger george@mvista.com
High-res-timers: http://sourceforge.net/projects/high-res-timers/
Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml