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From: Peter Grehan <grehan@freebsd.org>
To: Justin Hibbits <jrh29@alumni.cwru.edu>, freebsd-ppc@freebsd.org
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Date: Wed, 22 Oct 2008 01:57:14 +1000 (EST)
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Subject: Re: graphics on G4
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Hi Justin,

>An oddity I've found with FreeBSD/ppc on my G4 MDD --
>when I do anything with graphics, after a while the
>whole machine just hangs when I try to spawn a new
>process.  It's not a deterministic problem, it just
>happens 'eventually', but nearly 100% of the time it
>does happen

 The framebuffer uses a large chunk of kernel VM when mmap'd.
Are you able to dump some vm stats while doing this e.g.
sysctl vm.kvm_free ?

later,

Peter.