lots of interrupts

[Konstantin Svist]

I just ran powertop on a server which has a lot of small HTTP requests
coming in. I'm wondering if there's anything here that can be optimized
(other than powertop's suggestion of optimizing disk access... the
number of interrupts there is so low in comparison that it doesn't seem
worth the time).

Top causes for wakeups:
  30.9% (10350.7)       <interrupt> : eth0
  26.9% (9009.8)     <kernel core> : hrtimer_start_range_ns
(tick_sched_timer)
  21.5% (7194.3)      <kernel IPI> : Rescheduling interrupts
  14.4% (4813.7)       <interrupt> : eth1
   1.3% (428.0)            python : hrtimer_start_range_ns (hrtimer_wakeup)
   1.2% (387.2)            python : mod_timer (tcp_delack_timer)
   1.0% (349.7)            mysqld : mod_timer (tcp_delack_timer)
   0.9% (298.3)            python : mod_timer (tcp_write_timer)
   0.8% (276.2)            mysqld : mod_timer (tcp_write_timer)
   0.5% (158.7)      <kernel IPI> : TLB shootdowns


"Rescheduling interrupts" seems interesting. Can anything be done to get
rid of those? (e.g. binding a process to a specific CPU/core)