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SubjectRe: [PATCH][IO_APIC] 2.5.63bk7 irq_balance improvments / bug-fixes
>
>
> 2. Or move the heavy imbalance around all the cpus in the round robin
> fashion at high rate.
>
>
>Both the solutions will eliminate the bouncing behavior. The current
>implementation is based on the option 2, with the only difference of
>lower rate of distribution (5 sec). The optimal option is workload
>dependant. With static and heavy interrupt load, the option 2 looks
>better, while with random interrupt load the option 1 is good enough.
>
>
>
Hi Nitin,

Thanks much for your response !
Are you really sure that option 2 looks better on a static and heavy
interrupt load ?
If the load is generated by few heavy sources (sources_count <
count(cpus)) why not distributed them (mostly) statically across the
available cpus ? What gain do you have by rotating them round robin in
this case ?
I think round robin only starts making sense if the number of heavy
sources is > number of physical cpus.

Kai

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