linux-kernel - Re: 2.6.24-rc8-rt1

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Message-ID: <20080117124647.GK5859@pengutronix.de>
Date:	Thu, 17 Jan 2008 13:46:47 +0100
From:	Luotao Fu <l.fu@...gutronix.de>
To:	Wolfgang Grandegger <wg@...ndegger.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.24-rc8-rt1

Hi Wolfgang,

On Thu, Jan 17, 2008 at 11:13:26AM +0100, Wolfgang Grandegger wrote:
> Steven Rostedt wrote:
> It builds and runs fine on my Icecube-MPC5200 board, now also with the
> latency tracer enabled. That's great. Still, "cyclictest -n -p80 -i1000"
> reports latencies up to 400 us and therefore I tried to trigger and save
> a high latency trace using:
> 
>   # ./cyclictest -n -p80 -i1000 -b400
>   1.21 0.33 0.11 4/42 1048
> 
>   T: 0 (  914) P:80 I:1000 C:  38726 Min:     61 Act:  107 Avg:  106
> Max:     377
>   [   91.042169] (      cyclictest-914  |#0): new 39733427 us user-latency.
>   bash-3.00# cat /proc/latency_trace > trace.log
> 

I tested 2.6.24-rc8-rt1 on our phytec phyCORE-MPC5200B-tiny. I runned cyclictest
with exactly the same parameter as you used and made some non-rt Workload with
"hackbench 5" in a while 1 loop and a "ping -f" from a host machine. I run the
test for about 3 hours and could not push the latency to higher than 220 us.
(The latency tracer is also turned on in kernel). Could you please send me your
kernelconfig privately?

cheers
Luotao Fu
-- 
   Dipl.-Ing. Luotao Fu | Phone: +49-5121-206917-3
Pengutronix - Linux Solutions for Science and Industry
Entwicklungszentrum Nord     http://www.pengutronix.de


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