DragonFly-2.3.0.864.gc5b83 master sys/platform/pc32/apic mpapic.c sys/platform/pc32/isa clock.c sys/platform/pc64/isa clock.c sys/platform/vkernel/platform systimer.c sys/sys systimer.h
Hasso Tepper
hasso at estpak.ee
Mon May 4 11:08:43 PDT 2009
Matthew Dillon wrote:
> 450 interrupts/sec sounds ok for an idle system. I'd expect a
> higher number, actually.
Yes, but ...
> I wonder if the load calculations are being messed up by the C3
> state. The code path for the per-cpu hardclock interrupt has
> always been fairly sensitive. With the 8254 it was being driven by
> IPIs. Now it is being driven by an actual interrupt so there might be
> an issue with how it distinguishes the system state when accounting for
> the clock tick.
It seems to be a real load though - applications lag etc.
And one more thing. With sephe's change it's even worse _without_ lapic.
The interrupt load is still there and the rate of clock interrupts
doubles to ~800.
--
Hasso Tepper
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