On Mon, Apr 19, 2010 at 5:37 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
quoted text
> net_rps_action() is a bit expensive on NR_CPUS=64..4096 kernels, even if
> RPS is not active.
>
> I add a flag to scan cpumask only if at least one IPI was scheduled.
> Even cpumask_weight() might be expensive on some setups, where
> nr_cpumask_bits could be very big (4096 for example)

How about using a array to save the cpu IDs. The number of CPUs, to
which the IPI will be sent, should be small.

-- 
Regards，
Changli Gao(xiaosuo@gmail.com)
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