linux-kernel - Re: [patch 00/21] high resolution timers / dynamic ticks

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Message-Id: <20061002210053.16e5d23c.akpm@osdl.org>
Date:	Mon, 2 Oct 2006 21:00:53 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Jim Gettys <jg@...top.org>, John Stultz <johnstul@...ibm.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: [patch 00/21] high resolution timers / dynamic ticks - V2

These patches make my Vaio run really really slowly.  Maybe a quarter of
the normal speed or lower.  Bisection shows that the bug is introduced by
clockevents-drivers-for-i386.patch+clockevents-drivers-for-i386-fix.patch

With all patches applied, the slowdown happens with
CONFIG_HIGH_RES_TIMERS=n and also with CONFIG_HIGH_RES_TIMERS=y &&
CONFIG_NO_HZ=y.  So something got collaterally damaged.

I put various helpful stuff at http://userweb.kernel.org/~akpm/x/

I uploaded all the patches I was using to
http://userweb.kernel.org/~akpm/x/patches/

It doesn't seem to be a cpufreq thing: cpuinfo_min_freq=800kHz,
cpuinfo_max_freq=2GHz and cpuinfo_cur_freq goes up to 2GHz under load. 
Wall time is increasing at one second per second.

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