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Subject: Re: [patch] voluntary-preempt-2.6.8.1-P4
From: Lee Revell <rlrevell@joe-job.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
       Thomas Charbonnel <thomas@undata.org>,
       Florian Schmidt <mista.tapas@gmx.net>,
       Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>,
       William Lee Irwin III <wli@holomorphy.com>
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Date: Thu, 19 Aug 2004 06:43:36 -0400
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On Thu, 2004-08-19 at 06:38, Lee Revell wrote:
> On Thu, 2004-08-19 at 06:29, Lee Revell wrote:
> 
> > Yes, this takes care of it.  Now the dominant latency is the 142us
> > latency from the via-rhine driver, which is fixed by using the driver
> > from -mm (specifically it's fixed in bk-netdev.patch).
> > 
> 
> OK, this is a new one:
> 

This is the other common one:

preemption latency trace v1.0.1
-------------------------------
 latency: 74 us, entries: 9 (9)
    -----------------
    | task: XFree86/493, uid:0 nice:-10 policy:0 rt_prio:0
    -----------------
 => started at: schedule+0x5b/0x590
 => ended at:   schedule+0x2f0/0x590
=======>
 0.000ms (+0.000ms): schedule (work_resched)
 0.000ms (+0.000ms): sched_clock (schedule)
 0.001ms (+0.001ms): dequeue_task (schedule)
 0.001ms (+0.000ms): recalc_task_prio (schedule)
 0.002ms (+0.000ms): effective_prio (recalc_task_prio)
 0.002ms (+0.000ms): enqueue_task (schedule)
 0.004ms (+0.002ms): __switch_to (schedule)
 0.072ms (+0.067ms): finish_task_switch (schedule)
 0.073ms (+0.000ms): sub_preempt_count (schedule)

Not sure what to make of this one.

Lee