[POLLING] strange interrupt/system load

[rihad]

Barney Cordoba wrote:
> 
>> Without polling (current load around 190-200 mbit/s, around
>> 24-26 kpps):
>>
>> top:
>> CPU:  0.0% user,  0.0% nice,  8.4%
>> system,  0.0% interrupt, 91.6% idle
>>
>> Interrupts/s: 18322 total
>> 28 mpt0 irq16
>> 1999 cpu0: time
>> 6906 em0 irq256
>> 3392 em1 irq257
>> 1999 cpu1: time
>> 1999 cpu2: time
>> 1999 cpu3: time
> 
> You really need to look at the taskq usage as averaging on a 4 core
CPU:  0.0% user,  0.0% nice, 10.0% system,  0.0% interrupt, 90.0% idle
    27 root        1 -68    -     0K    16K -      1 137:47 40.28% em0 taskq
    28 root        1 -68    -     0K    16K -      2   5:05  0.88% em1 taskq

> You'll do a lot better setting your ITR to 2000 or so. You really don't
> need an interrupt every 4 packets at those traffic levels.

Sorry, how would I do that? And how do I find the current ITR value?