Red Hat Bugzilla – Bug 52086
RAM memory not fully utilised or recognised at boot
Last modified: 2007-04-18 12:36:03 EDT
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Description of problem:
RH 7.0 only recognises 1GB of 2GB installed RAM at boot. Checks
in /proc/meminfo etc show the lower amount of memory. Machine is a Dell
Precision 530 dual PIII Zeon, kernel is 2.2.16-22.
append="mem=2000M" added to lilo.conf and /sbin/lilo run, with no success.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Install RH 7.0
2.Boot with mem=2000M
Please try installing the "-enterprise" kernel; that kernel (in 7.0) is designed
to work with bigger amounts of memory.
Will using the enterpise kernel reduce the SMP performance ? The machine in
question is being used as a number cruncher and speed is the main thing. It's
being heavily used at the moment and I don't want to risk a reboot unless I
know the performance won't be affected.
On Red Hat Linux 7.0, the enterprise kernel has (or should have, I have never
benchmarked it myself) the same performance.
On Red Hat Linux 7.1 things are different. There the stock "SMP" kernel has
support for upto 4Gb (well actually 3.5Gb or so) and the "enterprise" kernel has
support for upto 64Gb. 64Gb support _does_ have a performance penalty.