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List:       linux-kernel
Subject:    Re: [patch] voluntary-preempt-2.6.8.1-P5
From:       Lee Revell <rlrevell () joe-job ! com>
Date:       2004-08-21 2:51:35
Message-ID: 1093056694.854.2.camel () krustophenia ! net
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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

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