Re: Measuring tools - top and interrupts

[Mike Galbraith]

On Sat, 2006-06-24 at 21:25 +0200, BjÃrn Steinbrink wrote:
> On 2006.06.24 18:23:12 +0200, Mike Galbraith wrote:
> > 
> > let's see.  Yeah, confirmed.
> 
> OK, it also depends on IO APIC being enabled and active, ie. noapic on
> the kernel command line will fix it as well as disabling
> CONFIG_X86_IO_APIC. That doesn't help me at all to understand why it
> happens though.

Ditto.

> The only difference with IO APIC disabled seems to be that the irq
> doesn't get ACKed before update_process_times() gets called.
> And your "fix" makes it being called outside of the xtime_lock spinlock
> and with a slightly different stack usage AFAICT.

(it's still under the xtime lock)

> But none of these should make a difference, right?

Not that I can see, but then it's pretty dark down here.  Anybody got a
flashlight I can borrow? ;-)

	-Mike

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