[asterisk-users] Asterisk 1.62.13 - CPU spikes every 10 minutes - NOT FIXED

[Mike]

Shaun,

Thanks, don`t think I don't appreciate all your time, I really do.  So
you`re saying it's possibly just fake smoke from a non-existent fire, and
that nothing is actually wrong despite a high load one one of the CPUs?

That`s what it really is: I am seeing smoke and am looking for a fire, maybe
I'm just being paranoid.  That`s what trending and SNMP alarms are for I
suppose ;-)

Mike




> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Shaun Ruffell
> Sent: Tuesday, September 28, 2010 14:57
> To: asterisk-users at lists.digium.com
> Subject: Re: [asterisk-users] Asterisk 1.62.13 - CPU spikes every 10
> minutes - NOT FIXED
> 
> On 09/28/2010 12:53 PM, Mike wrote:
> > Thanks for all the help.  I tried but couldn't see a definite spike
> anyways.
> > I used mpstat to see the irq% for each CPU, and although it shows me
> spikes
> > to 100% for one CPU (not always the same one is spiking irq%) the intr/s
> > isn't actually spiking.
> >
> > It`s like suddently there aren't more interrupts, but the IRQ% time for
> the
> > CPU shoots up.
> >
> > What can make it do that?
> 
> Now we're back to my original assertion that I believe what you're
> seeing is related to the way % cpu time is calculated statistically via
> a timer interrupt.  I would bet that you have a steady amount of cycles
> dedicated to servicing the interrupt handler but every 10 minutes there
> are a confluence of factors that affect the calculation.
> 
> You might be able to use a tool like cyclictest [1] to see if there
> really is some inordinate amount of scheduling latency every 10 minutes
> as opposed to some sampling anomaly.
> 
> [1] https://rt.wiki.kernel.org/index.php/Cyclictest
> 
> --
> Shaun Ruffell
> Digium, Inc. | Linux Kernel Developer
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at: www.digium.com & www.asterisk.org
> 
> --
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