From: Ingo Molnar <mingo@elte.hu>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Len Brown <lenb@kernel.org>,
akpm@osdl.org, mm-commits@vger.kernel.org, ak@muc.de,
johnstul@us.ibm.com, zippel@linux-m68k.org,
linux-acpi@vger.kernel.org, asit.k.mallick@intel.com,
Arjan van de Ven <arjan@infradead.org>
Subject: Re: + acpi-keep-track-of-timer-broadcasting-fix.patch added to -mm tree
Date: Tue, 30 Jan 2007 21:34:15 +0100 [thread overview]
Message-ID: <20070130203415.GD1246@elte.hu> (raw)
In-Reply-To: <1170115975.29240.111.camel@localhost.localdomain>
* Thomas Gleixner <tglx@linutronix.de> wrote:
> > Another alternative would be for systems with C3 to fall-back to a
> > periodic tick scheme that we have today. From a power point of view,
> > HZ=100 would be only a little bit worse than Windows HZ=64.
> > However, FC6 seems to have marched off an built with
> > HZ=1000 -- so we'd have some challenges with static HZ too...
>
> With dyntick enabled kernels you get ~ HZ=37 as the worst case with
> PIT, while we go down to ~4HZ with HPET / apic timer (as long as it
> works)
s/worst case/best case
the lower we can make the timer irq rate on an idle system, the better.
HPET allows us to go from 37 Hz down to 4 Hz.
Ingo
prev parent reply other threads:[~2007-01-30 20:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200701282247.l0SMl3rG005194@shell0.pdx.osdl.net>
[not found] ` <200701282153.29132.lenb@kernel.org>
[not found] ` <20070129065540.GB23785@elte.hu>
2007-01-29 23:55 ` + acpi-keep-track-of-timer-broadcasting-fix.patch added to -mm tree Len Brown
2007-01-30 0:12 ` Thomas Gleixner
2007-01-30 20:31 ` Ingo Molnar
2007-01-30 20:34 ` Ingo Molnar [this message]
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