Date: Sat, 18 Oct 2003 17:41:08 -0500 (CDT) From: Mike Silbersack <silby@silby.com> To: Yaoping Ruan <yruan@cs.princeton.edu> Cc: freebsd-hackers@freebsd.org Subject: Re: High mem (4GB) support on FreeBSD 4.8 Message-ID: <20031018173800.B706@odysseus.silby.com> In-Reply-To: <3F919CA9.F99EA2F0@cs.princeton.edu> References: <3F919CA9.F99EA2F0@cs.princeton.edu>
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On Sat, 18 Oct 2003, Yaoping Ruan wrote: > Hi: > > I installed the 4.8 release on a new box with 4GB memory, and found > kernel panic when I tried to write date. But the system run great with > only 2GB memory. Is there any kernel compiling option in the LINT, like > the "high mem" option in Linux? > > BTW, we also tried 4.6 release, didn't have this problem but had some > different issues. Some of the kernel autoscaling values may be off with 4GB machines; I believe that this has been fixed with 4.9, so running 4.9-RC3 might be the easiest answer. Alternately, try the following: 1. Check the mailing list archives, there might be a better explanation than I'm about to give. 2. Play with the amount of memory available using the hw.physmem tunable in loader.conf; you can set to to intermediate values, such as 3G, etc. 3. Tweak the tunable kern.vm.kmem.size upwards, it defaults to 200M, which is probably too small for a 4G machine; try 300 or 400M. Don't worry about PAE, that's only needed if you have _more_ than 4G of ram. Mike "Silby" Silbersack
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