Re: [sched, patch] better wake-balancing, #2

Chuck Ebbert
2005-07-30T23:30:01Z

On Fri, 29 Jul 2005 at 17:02:07 +0200, Ingo Molnar wrote:

> do wakeup-balancing only if the wakeup-CPU is idle.
>
> this prevents excessive wakeup-balancing while the system is highly
> loaded, but helps spread out the workload on partly idle systems.

I tested this with Volanomark on dual-processor PII Xeon -- the
results were very bad:

Before: 5863 messages per second

124169 schedule 64.1369
64663 _spin_unlock_irqrestore 4041.4375
7949 tcp_clean_rtx_queue 6.5370
6787 net_rx_action 24.9522

After: 5569 messages per second

139417 schedule 72.0129
82169 _spin_unlock_irqrestore 5135.5625
9949 tcp_clean_rtx_queue 8.1817
7917 net_rx_action 29.1066

__
Chuck