From: Andi Kleen <hidden> Date: 2005-10-06 10:32:15
Also in:lkml
"Chen, Kenneth W" [off-list ref] writes:
Even though
softirq is invoked at the end of dev_queue_xmit() via local_bh_enable(),
not all execution of softirq will result a __wake_up(). With higher
HZ rate, timer interrupt is more frequent and thus more softirq
invocation and leads to more __wake_up(), which then takes us to higher
throughput because cpu spend less time in idle.
This sounds like a serious bug somewhere if true.
-Andi