CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2793.01-MHz K8-class CPU) 0% idle?

[Robert Watson]

On Sat, 8 Jan 2005, Steve Clement wrote:

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> John Baldwin wrote:
> |
> |
> | I can't answer your % idle question, but the hyperthreading thing is
> because
> | you aren't using an SMP kernel (one with 'options SMP' in it, note that
> | GENERIC in 5.x does not have SMP turned on).  (The idle process would be
> | called 'idle: cpu0' if you had an SMP kernel.)
> |
> 
> Indeed, I was running a GENERIC Kernel and it lacked SMP support, now
> all is compiled in and I have a new phenomenon. 
> 
> I am seeing idle variations from 0% up to 50% in a rather cyclical way. 
> 
> HOW can I see what program causes this, top isn't much help but: 

Try using "top -S" which will include kernel threads in its output, so you
can see what threads in the kernel are generating the CPU load.

Robert N M Watson


> 
> steve at woodstock steve $ top -btd20s1 |grep idle
> CPU states: 74.8% user,  0.0% nice, 24.4% system,  0.8% interrupt,  0.0%
> idle
> CPU states: 72.4% user,  0.0% nice, 24.9% system,  2.7% interrupt,  0.0%
> idle
> CPU states: 71.3% user,  0.0% nice, 20.2% system,  0.8% interrupt,  7.8%
> idle
> CPU states: 56.3% user,  0.0% nice, 16.0% system,  2.3% interrupt, 25.4%
> idle
> CPU states: 68.5% user,  0.0% nice, 24.9% system,  0.4% interrupt,  6.2%
> idle
> CPU states: 72.5% user,  0.0% nice, 27.1% system,  0.4% interrupt,  0.0%
> idle
> CPU states: 49.8% user,  0.0% nice, 16.7% system,  1.2% interrupt, 32.3%
> idle
> CPU states: 16.0% user,  0.0% nice,  4.7% system,  0.0% interrupt, 79.3%
> idle
> CPU states: 30.7% user,  0.0% nice, 10.5% system,  0.8% interrupt, 58.0%
> idle
> CPU states: 55.5% user,  0.0% nice, 20.7% system,  0.4% interrupt, 23.4%
> idle
> CPU states: 30.7% user,  0.0% nice, 10.9% system,  1.2% interrupt, 57.2%
> idle
> CPU states: 45.3% user,  0.0% nice,  9.4% system,  0.8% interrupt, 44.5%
> idle
> CPU states: 73.9% user,  0.0% nice, 25.3% system,  0.8% interrupt,  0.0%
> idle
> CPU states: 65.9% user,  0.0% nice, 23.3% system,  1.2% interrupt,  9.7%
> idle
> CPU states: 21.0% user,  0.0% nice,  7.8% system,  0.4% interrupt, 70.8%
> idle
> CPU states: 60.5% user,  0.0% nice, 23.4% system,  1.6% interrupt, 14.5%
> idle
> CPU states: 61.5% user,  0.0% nice, 23.7% system,  0.8% interrupt, 14.0%
> idle
> CPU states: 54.7% user,  0.0% nice, 20.7% system,  1.6% interrupt, 23.0%
> idle
> CPU states: 34.6% user,  0.0% nice, 15.2% system,  0.4% interrupt, 49.8%
> idle
> 
> Thanks, Steve C
> 
> - --
> ION Network Solutions
> Steve Clement
> Unix System Administrator
> 209, rue des Romains
> L-8041 Bertrange
> Tel: +352 261 276-2
> Fax: +352 261 276-9
> mailto:steve at ion.lu
> http://www.ion.lu
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