Date: Wed, 27 Oct 2004 10:23:15 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Tom Gidden <gid@lonres.com> Cc: freebsd-questions@freebsd.org Subject: Re: 5.3-RELEASE on Dell PowerEdge 2850 Message-ID: <20041027152315.GA62279@dan.emsphone.com> In-Reply-To: <D0512C2C-2829-11D9-88E3-000A95794E84@lonres.com> References: <D0512C2C-2829-11D9-88E3-000A95794E84@lonres.com>
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In the last episode (Oct 27), Tom Gidden said: > I've recently got a few Dell PowerEdge 2850 machines with 4 GB RAM to > build a new database cluster. However, unlike our existing PowerEdge > 2650 machines, they're only recognising about 3.25 GB. The machines > are pretty much standard, with no extra cards (just the built-in > MegaRAID). > > As a last resort, I've tried rebuilding the kernel with > MAXMEM=(4*1024*1024), which produces some really fun crashes (which I > can supply if necessary). The BIOS seems to be devoid of anything > remotely useful to tweak. > > Any ideas? > > Here's a dmesg from the non-crashing kernel: [note, the first line > is from memory and might be incorrect] > > 786426K of memory above 4GB ignored It looks like you will need to enable PAE to access the rest of that memory (see the pae manpage; some hardware will not work with it enabled). Dell has apparently put quite a bit of your memory past the 4GB point, and left a 700MB hole somewhere in lower memory. I think if you do a boot -v, it will print the memory ranges. -- Dan Nelson dnelson@allantgroup.com
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