From: Elizabeth Barham <soggytrousers@yahoo•com>
To: Benjamin Herrenschmidt <benh@kernel•crashing.org>
Cc: <debian-powerpc@lists•debian.org>, <linuxppc-dev@lists•linuxppc.org>
Subject: Re: "Cache Profiler" ? (was: No cache control on ppc??)
Date: 15 Jan 2002 03:17:32 -0600 [thread overview]
Message-ID: <87vge455xv.fsf@liliwhite.open.oasis> (raw)
In-Reply-To: Benjamin Herrenschmidt's message of "Sun, 13 Jan 2002 20:36:19 +0100"
> First boot once with BootX. Once in linux, grab the value of
> /proc/sys/kernel/l2cr. Then, go back to quik, and in your boot
> scripts, write back this value. This is the configuration of the
> backside L2 cache of the 750.
Just a follow-up:
It turns out that Linux was using the 750 processor with it's
configuration (1,0,0,1 [NewerTech G3L2]) but it was not using the
cache at all. In order to grab the parameters of the above-mentioned
file in the /proc/sys/kernel directory I had to install Mac
OS. Fortunatly we had an extra drive available to install it upon.
The configuration that I had been using, though, disabled the cache so
I had to find a better setting that was quicker and stable (0,0,1,0
[240 MHz, 478.41 bogomips]). However, the gotcha! with this is that
quik (v2.0) throws a fatal error prior to the start-screen ("Choose
your kernel").
So, I ended up just keeping MacOS on half of the newly-installed drive
and will use BootX to boot into Linux now and in the future; it's not
*that* inconvenient and the increase in speed is easily worth it.
Thank you all for your help.
Kind regards, Elizabeth
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2002-01-15 9:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.21.0201121753510.11140-100000@darkwing.informatik.uni-stuttgart.de>
2002-01-12 21:39 ` No cache control on ppc?? Albert D. Cahalan
2002-01-13 5:36 ` Timothy A. Seufert
2002-01-13 6:51 ` Albert D. Cahalan
2002-01-13 8:06 ` "Cache Profiler" ? (was: No cache control on ppc??) Elizabeth Barham
2002-01-13 19:36 ` Benjamin Herrenschmidt
2002-01-15 9:17 ` Elizabeth Barham [this message]
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