Re: balance storm

Mike Galbraith
2014-05-27T13:20:18Z

On Tue, 2014-05-27 at 20:50 +0800, Libo Chen wrote:

> in my box:
>
> perf top -g --sort=symbol
>
> Events: 3K cycles
> 73.27% [k] read_hpet
> 4.30% [k] _raw_spin_lock_irqsave
> 1.88% [k] __schedule
> 1.00% [k] idle_cpu
> 0.91% [k] native_write_msr_safe
> 0.68% [k] select_task_rq_fair
> 0.51% [k] module_get_kallsym
> 0.49% [.] sem_post
> 0.44% [.] main
> 0.41% [k] menu_select
> 0.39% [k] _raw_spin_lock
> 0.38% [k] __switch_to
> 0.33% [k] _raw_spin_lock_irq
> 0.32% [k] format_decode
> 0.29% [.] usleep
> 0.28% [.] symbols__insert
> 0.27% [k] tick_nohz_stop_sched_tick
> 0.27% [k] update_stats_wait_end
> 0.26% [k] apic_timer_interrupt
> 0.25% [k] enqueue_entity
> 0.25% [k] sched_clock_local
> 0.24% [k] _raw_spin_unlock_irqrestore
> 0.24% [k] select_idle_sibling

read_hpet? Are you booting box notsc or something? Migration cost is
the least of your worries.

-Mike