linux-kernel - Re: Sched - graphic smoothness under load

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Date:	Sun, 20 May 2007 08:12:13 +0200
From:	Michael Gerdau <mgd@...hnosis.de>
To:	Bill Davidsen <davidsen@....com>
Cc:	Ray Lee <ray@...rabbit.org>,
	Linux Kernel M/L <linux-kernel@...r.kernel.org>
Subject: Re: Sched - graphic smoothness under load - cfs-v13 sd-0.48

> Okay, here's a bonus, http://www.tmr.com/~davidsen/sched_smooth_02.html 
> not only has the right values, the labels are changed, and I included 
> more data points from the fc6 recent kernel and the 2.6.21.1 kernel with 
> the mainline scheduler.
> 
> The nice thing about this test and the IPC test I posted recently is 
> that they are reasonable stable on the same hardware, so even if someone 
> argues about what they show, they show the same thing each time and can 
> therefore be used to compare changes.

I'm not sure I follow you here. The difference between 2.6.21 and 2.6.21.1
are two simple (as in involving little code) changes to ip4 and ip6 net
and I'm not even sure that code is used at all in your tests.
[Read: IMO the 2.6.21 and 2.6.21.1 figures are for identical cases].

Assuming the above is correct then IMO the variance between the two
"dublicated" lines (cfs-v13 and sd048) is such that I would not have
written "that they are reasonable stable on the same hardware".

I don't want to say the values aren't useful. I simply think there is
a high noiselevel.

Best,
Michael
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