Fwd: Interrupt Overload

[Konstantin Belousov]

On Sat, Jun 07, 2014 at 12:48:16PM -0400, Dutch Ingraham wrote:
> On 06/07/2014 12:04 PM, Vladislav Prodan wrote:
> > 
> > 
> >  
> >  --- Original message ---
> >  From: "Dutch Ingraham" <stoa at gmx.us>
> >  Date: 7 June 2014, 18:33:12
> >   
> > 
> >>
> >> Thanks for the response.
> >>
> >> The output you requested:
> >>
> >> kern.eventtimer.choice: HPET1 (440) HPET2 (440) HPET3 (440) HPET4 (440)
> >> HPET5 (440) HPET6 (440) LAPIC (400) i8254 (100) RTC (0)
> >>
> >> kern.eventtimer.choice: HPET (did not specify 1, 2, etc.)
> >>
> >> I also changed the type of timer to LAPIC and rebooted; there was no
> >> appreciable change in the interrupt activity.
> > 
> > After reboot what became timer? :)
> > 
> > You can change the timer "on the fly", without rebooting the system.
> > 
> > If LAPIC does not help, then try other timers.
> > 
> > 
> > --
> >  Vladislav V. Prodan
> >  System & Network Administrator
> >  support.od.ua
> >  
> > _______________________________________________
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> > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
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> > 
> 
> You're right, it is not persistent.  I changed to each different event
> timer and the only one that made a difference was the i8254; that
> dropped the cpu load from 30% to 10-12%.  Much better, but still of
> course not acceptable for a Core II-Duo running at 3.0GHz.  The load
> averages shown in <top> do also drop proportionally.  Interestingly,
> though, <systat -vmstat> shows the same interrupt rate - 325K/sec.
> 
> What do you make of the fact that when I suspend with <<acpiconf -s 3>
> and then wake-up, everything is absolutely normal, regardless of event
> timer type?

You did not shown _useful_ output of vmstat -i.  Do it when the storm
occurs.  Also, show the pciconf -lvc output on the machine.
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