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

[George Anzinger]

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@xxxxxxxxxx
High-res-timers:  http://sourceforge.net/projects/high-res-timers/
Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml

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