From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Mikael Pettersson <mikpe@csd.uu.se>
Cc: linuxppc-dev list <linuxppc-dev@ozlabs.org>,
Paul Mackerras <paulus@samba.org>,
Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: BUG: 2.6.11-rc2 and -rc1 hang during boot on PowerMacs
Date: Thu, 27 Jan 2005 00:51:25 +1100 [thread overview]
Message-ID: <1106747485.5235.68.camel@gaston> (raw)
In-Reply-To: <16887.27336.161685.55774@alkaid.it.uu.se>
On Wed, 2005-01-26 at 11:02 +0100, Mikael Pettersson wrote:
> Benjamin Herrenschmidt writes:
> > On Tue, 2005-01-25 at 09:56 +0100, Mikael Pettersson wrote:
> >
> > > On the eMac:
> > > /proc/sys/kernel/powersave-nap exists and contains "0".
> > > /proc/device-tree/cpus/PowerPC,G4/flush-on-lock exists as an empty file.
> >
> > Ok, that is weird... so for some reason, Apple decided not to allow the
> > eMac to do NAP mode, and thus to power manage the CPU when idle...
>
> I assumed it was due to the UniNorth issue that pmac_feature.c mentions.
Not clear. I would expect the eMac to run with a fairly recent revision
of UniNorth with no issue, and since it's not an SMP machine there
should be no problem...
On the other hand, I also suspect that the whole NAP thing does have a
small impact on performances, so that may be the reason they chose not
to do it on this HW...
Ben.
next prev parent reply other threads:[~2005-01-26 13:52 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-22 17:23 BUG: 2.6.11-rc2 and -rc1 hang during boot on PowerMacs Mikael Pettersson
2005-01-23 0:43 ` Benjamin Herrenschmidt
2005-01-24 1:25 ` Benjamin Herrenschmidt
2005-01-24 17:42 ` Mikael Pettersson
2005-01-25 3:25 ` Benjamin Herrenschmidt
2005-01-25 8:56 ` Mikael Pettersson
2005-01-25 23:47 ` Benjamin Herrenschmidt
2005-01-26 10:02 ` Mikael Pettersson
2005-01-26 13:51 ` Benjamin Herrenschmidt [this message]
2005-01-26 21:33 ` Sylvain Munaut
2005-01-26 22:11 ` Benjamin Herrenschmidt
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