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

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")