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* [9fans] interrupts (non-plan9 related)
@ 2005-04-12 17:22 andrey mirtchovski
  2005-04-12 17:28 ` Nigel Roles
  0 siblings, 1 reply; 2+ messages in thread
From: andrey mirtchovski @ 2005-04-12 17:22 UTC (permalink / raw)
  To: 9fans

i've got a dual-cpu machine running linux.  i'm looking at sar reports
for the box and can't really understand what happens -- the machine
services all interrupts at CPU0 (actually the first hyperthreaded part
of CPU0).

is this supposed to be normal?

here is how the interrupts were reported just before a major crash:



21:30:48 PM CPU i000/s i001/s i002/s i008/s i011/s i014/s i027/s i028/s i029/s i030/s
21:30:58 PM 0 99.90 0.00 0.00 0.00 0.00 0.00 500.60 1.80 671.90 4.30
21:30:58 PM 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
21:30:58 PM 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
21:30:58 PM 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
21:31:08 PM 0 100.00 0.00 0.00 0.00 0.00 0.00 639.80 0.00 2570.20 4.10
21:31:08 PM 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
21:31:08 PM 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
21:31:08 PM 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average:       0  100.00    0.00    0.00    0.00    0.00    0.00  146.48    0.60 2671.07 1318.77
Average:       1    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
Average:       2    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
Average:       3    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00



^ permalink raw reply	[flat|nested] 2+ messages in thread

* RE: [9fans] interrupts (non-plan9 related)
  2005-04-12 17:22 [9fans] interrupts (non-plan9 related) andrey mirtchovski
@ 2005-04-12 17:28 ` Nigel Roles
  0 siblings, 0 replies; 2+ messages in thread
From: Nigel Roles @ 2005-04-12 17:28 UTC (permalink / raw)
  To: Fans of the OS Plan 9 from Bell Labs

9fans-bounces+ngr=9fs.org@cse.psu.edu wrote:
> i've got a dual-cpu machine running linux.  i'm looking at sar reports
> for the box and can't really understand what happens -- the machine
> services all interrupts at CPU0 (actually the first hyperthreaded
> part of CPU0). 
> 
> is this supposed to be normal?
> 
> here is how the interrupts were reported just before a major crash:
> 
> 
> 
> 21:30:48 PM CPU i000/s i001/s i002/s i008/s i011/s i014/s i027/s
> i028/s i029/s i030/s 21:30:58 PM 0 99.90 0.00 0.00 0.00 0.00 0.00
> 500.60 1.80 671.90 4.30 21:30:58 PM 1 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 0.00 0.00 21:30:58 PM 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 0.00 21:30:58 PM 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 21:31:08 PM 0 100.00 0.00 0.00 0.00 0.00 0.00 639.80 0.00
> 2570.20 4.10 21:31:08 PM 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 21:31:08 PM 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 21:31:08 PM 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> Average:       0  100.00    0.00    0.00    0.00    0.00    0.00
> 146.48    0.60 2671.07 1318.77
> Average:       1    0.00    0.00    0.00    0.00    0.00    0.00
>   0.00    0.00    0.00    0.00
> Average:       2    0.00    0.00    0.00    0.00    0.00    0.00
>   0.00    0.00    0.00    0.00
> Average:       3    0.00    0.00    0.00    0.00    0.00    0.00
>   0.00    0.00    0.00    0.00

Yes, quite normal.
You have to manually assign interrupts to different processors
if you want to spread the load.



^ permalink raw reply	[flat|nested] 2+ messages in thread

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