linux-kernel - Re: performance -cfs19 vs. -ck1 for 2.6.22

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Message-ID: <20070716082917.GA1325@elte.hu>
Date:	Mon, 16 Jul 2007 10:29:17 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Ni@m" <niam.niam@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: performance -cfs19 vs. -ck1 for 2.6.22

* Ni@m <niam.niam@...il.com> wrote:

> Using 2.6.22 or 2.6.22-cfs19 my firefox hangs for some time(~4-5 
> seconds) when I'm trying to open any url, but with 2.6.22-ck1 firefox 
> doesn't hang at all or at least for a second when I have lots of open 
> tabs.

hm, is there no other workload on the system? Could you run the 
following script:

   http://people.redhat.com/mingo/cfs-scheduler/tools/cfs-debug-info.sh

while you are busy opening new tabs on a CFSv19 kernel (and send me the 
file it outputs)?

One way to start up the script precisely would be to start it in a 
terminal like this:

  sleep 10; echo "soon ..."; sleep 1; ./cfs-debug-info.sh

that way you have 10 seconds to switch from the terminal to firefox, and 
you can time the delay of firefox precisely on the start-time of the 
debug script.

	Ingo
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