linux-kernel - Re: [BUG] Strange 1-second pauses during Resume-from-RAM

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Date:	Sun, 2 Dec 2007 22:10:26 +0100
From:	Jörn Engel <joern@...fs.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jörn Engel <joern@...fs.org>,
	Mark Lord <lkml@....ca>, Pavel Machek <pavel@....cz>,
	Mark Lord <liml@....ca>, Thomas Gleixner <tglx@...utronix.de>,
	len.brown@...el.com, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	rjw@...k.pl
Subject: Re: [BUG] Strange 1-second pauses during Resume-from-RAM

On Sun, 2 December 2007 21:45:59 +0100, Ingo Molnar wrote:
> 
> to capture that trace i did not use -rt, i just patched latest -git 
> with:
> 
>   http://people.redhat.com/mingo/latency-tracing-patches/latency-tracing-v2.6.24-rc3.combo.patch
> 
> (this has your fixes included already)
> 
> have done:
> 
>   echo 1 > /proc/sys/kernel/mcount_enabled
> 
> and have run:
> 
>   ./trace-cmd sleep 1 > trace.txt
> 
>   http://people.redhat.com/mingo/latency-tracing-patches/trace-cmd.c
> 
> to capture a 1 second trace of what the system is doing. I think your 
> troubles are due to running it within a qemu guest - that is not a 
> typical utilization so you are on unchartered waters.

Maybe one more thing: can you send me the config you used for the setup
above?  I'd like to know whether qemu or my config is to blame.

Jörn

-- 
Eighty percent of success is showing up.
-- Woody Allen
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