From: Bob Breuer <breuerr@mc.net>
To: sparclinux@vger.kernel.org
Subject: Re: [PATCH] migration cost tune up in sparc smp
Date: Mon, 12 Jun 2006 01:21:09 +0000 [thread overview]
Message-ID: <448CC185.80500@mc.net> (raw)
In-Reply-To: <4483db6b9a343@wp.pl>
David Miller wrote:
> But why in the world does the scheduler "lock up" just because the
> migration cost is too large?
There is an address space collision between the vmalloc area and where
the prom maps the framebuffer.
The vmalloc range is 0xfe600000 to 0xffc00000. I have a cg6 that gets
mapped to 0xfee00000, and a cg14 with 8MB vsimm that gets mapped to
0xfe700000. These leave only 8MB and 1MB of usable vmalloc space before
bad things happen.
We may want to find a different vm hole to put vmalloc into. Is there
any documentation on what address spaces are reserved with the different
prom versions?
Bob
next prev parent reply other threads:[~2006-06-12 1:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-05 7:21 [PATCH] migration cost tune up in sparc smp Krzysztof Helt
2006-06-11 1:11 ` David Miller
2006-06-12 1:21 ` Bob Breuer [this message]
2006-06-12 3:54 ` David Miller
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