From: Arjan van de Ven <arjan@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: "Vegard Nossum" <vegard.nossum@gmail.com>,
"Ingo Molnar" <mingo@elte.hu>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Andreas Herrmann" <andreas.herrmann3@amd.com>,
"S.Çag(lar Onur" <caglar@pardus.org.tr>,
Valdis.Kletnieks@vt.edu, "Matt Mackall" <mpm@selenic.com>,
linux-kernel@vger.kernel.org, lenb@kernel.org
Subject: Re: [BISECTED] Lots of "rescheduling IPIs" in powertop
Date: Wed, 14 May 2008 06:55:58 -0700 [thread overview]
Message-ID: <20080514065558.41071ca8@infradead.org> (raw)
In-Reply-To: <482A8D7D.7000208@firstfloor.org>
On Wed, 14 May 2008 08:58:05 +0200
> > If the bios says mwait is usable, we need to use it with the values
> > IT gives us.
>
> At least to my knowledge the ACPI FADT just says what C states are
> available, not if they are implemented with MWAIT or using IO ports.
_CST does; which is what the mwait C-state selection code uses.
(and we've seen quirky systems where C1 mwait didn't work, SMM did
something wrong or something, because the other OS doesn't seem to use
it for that, so making it the default is not really an option)
next prev parent reply other threads:[~2008-05-14 13:56 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-13 20:42 [BISECTED] Lots of "rescheduling IPIs" in powertop Vegard Nossum
2008-05-13 20:54 ` Andi Kleen
2008-05-13 21:09 ` Vegard Nossum
2008-05-13 21:19 ` Andi Kleen
2008-05-14 4:02 ` Arjan van de Ven
2008-05-14 6:58 ` Andi Kleen
2008-05-14 13:55 ` Arjan van de Ven [this message]
2008-05-14 15:21 ` Andi Kleen
2008-05-14 6:00 ` Vegard Nossum
2008-05-14 6:56 ` Ingo Molnar
2008-05-14 7:11 ` Vegard Nossum
2008-05-14 9:09 ` Andreas Herrmann
2008-05-14 11:42 ` Andi Kleen
2008-05-15 16:10 ` Andreas Herrmann
2008-05-16 8:40 ` Ingo Molnar
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