[Asterisk-Users] OT: Hardware Interrupts; Who is it?

[Kevin Collins]

Matthew,

I see similar timer interrupts from using ztdummy as my timing reference, should be about 1k per sec.
 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Matthew Boehm
Sent: Monday, September 19, 2005 4:52 PM
To: Asterisk Users
Subject: Re: [Asterisk-Users] OT: Hardware Interrupts; Who is it?

           CPU0       CPU1
  0:         85 1703809954    IO-APIC-edge  timer
  8:          0          0    IO-APIC-edge  rtc
  9:          0          1   IO-APIC-level  acpi
 14:          0         31    IO-APIC-edge  ide0
177:          0   17840313   IO-APIC-level  megaraid
185:          0 1817423967   IO-APIC-level  eth0
193:          0   40198530   IO-APIC-level  eth1
201:          0 3507106255   IO-APIC-level  wanpipe1, wanpipe2, wanpipe3,
wanpipe4
NMI:          0          0
LOC: 1633394197 1633394188
ERR:          0
MIS:          0

Any idea what "LOC" and "timer" are? I did "watch -n1 cat /proc/interrupts"
for about a minute. The largest movers were "timer", "LOC" and "eth0". The
others either never change or hardly changed.

-Matthew

> From: Sig Lange <sig.lange at gmail.com>
> Reply-To: <sig.lange at gmail.com>, Asterisk Users Mailing List - Non-Commercial
> Discussion <asterisk-users at lists.digium.com>
> Date: Mon, 19 Sep 2005 15:34:26 -0400
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> <asterisk-users at lists.digium.com>
> Subject: Re: [Asterisk-Users] OT: Hardware Interrupts; Who is it?
> 
> It means you have a piece of hardware that is generating a lot of interupts.
> Try a few commands like this:
> 
> # vmstat 1
> # watch -n1 cat /proc/interrupts
> Go through lspci -vb and disable hardware that's not being used.
> 
> Watch the numbers as they increase. Also check for ERR and MIS
> 
> 
> On 9/19/05, Rich Adamson <radamson at routers.com> wrote:
>> 
>> 
>>> OK. Perhaps I was not clear. Please read my original post again:
>>> 
>>>>>>> I've been trying to diagnose why my server has a constant idle time
>> of 90%
>>>>>>> even when nothing is running.
>>> 
>>> I did not say "90% usage" I said "90% idle". Meaning I have a constant
>> CPU
>>> usage of 10%.
>>> 
>>> This 10% measurement comes from the "hardware interrupt" (hi) from
>> within
>>> "top":
>>> 
>>> Cpu(s): 3.8% us, 2.1% sy, 0.0% ni, 85.5% id, 0.2% wa, 8.0% hi, 0.4% si
>>> 
>>> 
>>> Even when all other percentages are at 0%, hi remains around 10%. How
>> can I
>>> figure out what is causing all these interrupts?
>> 
>> I don't have a clue other then to unload drivers, etc.
>> 
>> 
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> 
> 
> 
> -- 
> Sig Lange
> http://www.signuts.net/
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