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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>
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On Thu, 2004-08-19 at 03:32, Ingo Molnar wrote:
> i've uploaded the -P4 patch:
> 
>   http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P4

I think I am seeing those weird ~1 ms latencies still (actually I am not
sure I saw before now):

http://krustophenia.net/testresults.php?dataset=2.6.8.1-P4#/var/www/2.6.8.1-P4/kswapd_latency_trace.txt

This was the result of doing `make -j12' with a large C++ program (I
know, I wanted to see what would happen).  This gradually slowed the
machine to a crawl - for a while I could watch the /proc/latency_trace
fiels and see the latency gradually climbing.  Eventually tha machine
ground almost to a halt, with lots of disk activity., and trying to
switch from X to a console window resulted in a blank screen for 2-3
minutes.  I did eventually get a text console and was able to kill all
the cc1plus processes, and the machine went back to normal.

The link above is the highest latency recorded during this episode.

Lee