From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Pavel Machek <pavel@ucw.cz>,
kernel list <linux-kernel@vger.kernel.org>,
mingo@redhat.com, Andrew Morton <akpm@osdl.org>
Subject: Re: 2.6.19-rc4-mm1: noidlehz problems
Date: Wed, 1 Nov 2006 15:22:01 +0000 [thread overview]
Message-ID: <20061101152201.GA13634@srcf.ucam.org> (raw)
In-Reply-To: <1162386177.23744.17.camel@laptopd505.fenrus.org>
On Wed, Nov 01, 2006 at 02:02:57PM +0100, Arjan van de Ven wrote:
> In some (hardware) C-states, the local apic timer stops (as does the
> TSC), while in others it keeps running. If you change from AC to
> battery, the bios can change the meaning of a software C-state from one
> where local apic timer keeps going to one where it stops. This obviously
> upsets the hrtimers/tickless code since that uses local apic timer for
> event generation....
Is there any hope of working around this? I'd have expected that the
most useful case for the tickless code was also the case where we want
to be using C3/C4...
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2006-11-01 15:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-01 12:23 2.6.19-rc4-mm1: noidlehz problems Pavel Machek
2006-11-01 12:55 ` Pavel Machek
2006-11-01 13:02 ` Arjan van de Ven
2006-11-01 13:20 ` Pavel Machek
2006-11-01 15:22 ` Matthew Garrett [this message]
2006-11-01 20:55 ` Thomas Gleixner
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