Messages in this thread | | | Date | Sat, 13 Mar 1999 19:01:38 +0100 | From | Andi Kleen <> | Subject | Re: [patch] kstat change to see how much Linux SMP really scale well |
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On Sat, Mar 13, 1999 at 06:08:15PM +0100, Ingo Molnar wrote: > > On Sat, 13 Mar 1999, Andi Kleen wrote: > > > > But I see a clever and more fun way to avoid losing ticks in both the irq > > > handler and in the smp timer interrupt, and it's to always calc the delta > > > between rdtsc inside the smp timer irq. I can go into that. > > > > Exactly what I had in mind. Actually I'm surprised that Linux doesn't do > > that already @) > > this is a non-issue, really. It simply does not happen. I've profiled a > slow and old dual-P100 for hours under heavy load and i never got a lost > SMP timer interrupt.
I think it depends on the drivers. I assume your old P100 didn't have a polling SCSI controller that disabled local interrupts with the iorequest spinlock for ages.
-Andi
-- This is like TV. I don't like TV.
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