Re: [PATCH 1/2] timer: Avoid waking up an idle-core by migrate running timer

[Eric Dumazet]

On Tue, 2015-04-21 at 23:32 +0200, Thomas Gleixner wrote:

> 
> Are you realizing that __mod_timer() is a massive hotpath for network
> heavy workloads?

BTW I was considering using mod_timer_pinned() from these networking
timers (ie sk_reset_timer())

get_nohz_timer_target() sounds cool for laptop users, but is one cause
for bad responses to DDOS, when the selected cpu gets stressed.

This is the reason I used mod_timer_pinned() in commit 789f558cfb3680ae
("tcp/dccp: get rid of central timewait timer")



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