Bug 52086 - RAM memory not fully utilised or recognised at boot
RAM memory not fully utilised or recognised at boot
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Brock Organ
Depends On:
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Reported: 2001-08-20 09:13 EDT by s.rees
Modified: 2007-04-18 12:36 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2003-06-06 13:38:20 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description s.rees 2001-08-20 09:13:04 EDT
From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows 95; UUNET)

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):

How reproducible:

Steps to Reproduce:
1.Install RH 7.0
2.Boot with mem=2000M

Additional info:
Comment 1 Arjan van de Ven 2001-08-20 09:23:45 EDT
Please try installing the "-enterprise" kernel; that kernel (in 7.0) is designed
to work with bigger amounts of memory.
Comment 2 s.rees 2001-08-22 03:19:26 EDT
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.
Comment 3 Arjan van de Ven 2001-08-22 03:25:31 EDT
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.

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