Re: [patch] voluntary-preempt-2.6.8.1-P5

Lee Revell
2004-08-21T02:51:43Z

On Fri, 2004-08-20 at 09:30, Ingo Molnar wrote:
> i've uploaded the -P5 patch:
>
> http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P5

> - added a preempt_count field to /proc/latency_trace. This makes it
> easier to spot IRQ contexts and generally it gives a nice overview of
> how the preemption depth changes. It should also help us debug
> those 900usec weirdnesses related to cpu_idle. (if they still occur)
>

Ok, disregard my question about what this field was.

> - made the tcp packet-queue collapsing dependent on VOLUNTARY_PREEMPT.
>

I am seeing ~180usec latencies related to netif_receive_skb:

http://krustophenia.net/testresults.php?dataset=2.6.8.1-P6#/var/www/2.6.8.1-P6/trace5.txt

Lee