[RFC] Event timers on PowerPC

[Andreas Tobler]

On 07.09.10 06:35, Alexander Motin wrote:
> Andreas Toler wrote:
>> G5 after:
>> ---------
>> [bohrium:~] andreast% vmstat -i
>> interrupt                          total       rate
>> cpu0:decrementer                 1957106        783
> ...
>> cpu1:decrementer               176153140      70517
>> Total                          179730709      71949
>
> This look strange. Is there indeed such amount of interrupts on CPU1?
> What patches have you applied? Is it constant or periodic? What can you
> see in `systat -vm 1`?

Hm, for the details we might ask Nathan.

I applied all three mentioned patches, the base patch and the two 
powerpc patches.

Below the vmstat -i 1 output. The system is up for 5' now. No activity, 
only a few times the below command. The values of the decrementer 
increases continously. About ten within 2''. (early morning observing)

I'll be back in the evening for further tests.

Andreas

[bohrium:~] andreast% vmstat -i 1
interrupt                          total       rate
cpu0:decrementer                   49668        172
irq42: iichb0                        690          2
irq312: htpic0                       691          2
irq316: aoagpio0                       1          0
irq282: iichb1                        30          0
irq257: pcm0                           1          0
irq283: ohci0                          1          0
irq284: ohci1                          1          0
irq319: ohci2 ohci+                  314          1
irq295: ata0                          39          0
irq296: fwohci0                       11          0
irq297: gem0                         591          2
irq256: atapci0                     1662          5
irq376: IPI                        20195         70
cpu1:decrementer               176117266     611518
Total                          176191161     611774