linux-kernel - Re: [ck] Re: [ANNOUNCE] Staircase Deadline cpu scheduler version 0.45

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Message-ID: <20070422130725.GA16601@1wt.eu>
Date:	Sun, 22 Apr 2007 15:07:25 +0200
From:	Willy Tarreau <w@....eu>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	ck@....kolivas.org, Michael Gerdau <mgd@...hnosis.de>,
	Nick Piggin <npiggin@...e.de>,
	Gene Heskett <gene.heskett@...il.com>,
	Al Boldi <a1426z@...ab.com>,
	Bill Huey <billh@...ppy.monkey.org>,
	Mike Galbraith <efault@....de>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	William Lee Irwin III <wli@...omorphy.com>,
	Peter Williams <pwil3058@...pond.net.au>,
	Matt Mackall <mpm@...enic.com>
Subject: Re: [ck] Re: [ANNOUNCE] Staircase Deadline cpu scheduler version 0.45

On Sun, Apr 22, 2007 at 10:18:32PM +1000, Con Kolivas wrote:
> On Sunday 22 April 2007 21:42, Con Kolivas wrote:
> 
> Willy I'm still investigating the idle time and fluctuating load as a separate 
> issue.

OK.

> Is it possible the multiple ocbench processes are naturally 
> synchronising and desynchronising and choosing to sleep and/or run at the 
> same time?

I don't think so. They're independant processes, and I insist on reducing
their X work in order to ensure they don't get perturbated by external
factor. Their work consist in looping 250 ms and waiting 750 ms, then
displaying a new progress line.

> I can remove the idle time entirely by running ocbench at nice 19 
> which means they are all forced to run at basically the same time by the 
> scheduler.

It may indicate some special handling of nice ?

> Anyway the more important part is... Can you test this patch please? Dump
> all the other patches I sent you post 045. Michael, if you could test too
> please?

OK, I will restart from fresh 0.45 and try again.

Regards,
Willy

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