8gb memory on Redhat AS 2.1

Pankaj Govil pgovil at chipublib.org
Fri Oct 12 18:28:05 UTC 2007

A Server that is using uniprocessor kernel will only recognize 4GB RAM

This is how a server which was not using smp module showed 

# more /proc/meminfo  
MemTotal:      3107748 kB 
MemFree:       2550724 kB 
Buffers:        195056 kB 
Cached:         147660 kB 
SwapCached:          0 kB 
Active:         295124 kB 
Inactive:       199776 kB 
HighTotal:     2227872 kB 
HighFree:      1934336 kB 
LowTotal:       879876 kB 
LowFree:        616388 kB 
SwapTotal:           0 kB 
SwapFree:            0 kB 
Dirty:             732 kB 
Writeback:           0 kB 
Mapped:         221648 kB 
Slab:            40356 kB 
CommitLimit:   1553872 kB 
Committed_AS:   866636 kB 
PageTables:       2920 kB 
VmallocTotal:   106488 kB 
VmallocUsed:      5816 kB 
VmallocChunk:    99928 kB 
HugePages_Total:     0 
HugePages_Free:      0 
Hugepagesize:     4096 kB  

You will have to update the kernel. 

up2date-nox -uf kernel-smp


Pankaj Govil

-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com] On Behalf Of Steve Phillips
Sent: Tuesday, October 09, 2007 1:07 AM
To: tony.delov at gribbles.com.au; General Red Hat Linux discussion list
Subject: Re: 8gb memory on Redhat AS 2.1

t wrote:
> Hi All,
> Im running Redhat AS 2.1 on an IBM HS20 Blade Server.
> I have just upgraded the ram to 8Gb.
> The 8Gb memory shows up in the bios but the linux system only shows
> Is there any special way to get the extra memory recognized in Redhat 
> AS 2.1?
> I have a server that's running Redhat ES 2.1 that has 8gb of ram.
> That system has a custom kernel and is running on different hardware, 
> I'm wondering if that would be the reason why?

Its been a while since I compiled a kernel, but I believe there used to
be a 'bigmem' option that needed to be enabled if you had more than 4Gig
of RAM in the box.

I dont recall which kernel version this was in - try pulling down a
2.4.x kernel and running the make xconfig (or whatever) on a box and
seeing what options there are and comparing it possibly to your custom
kernel's 'make xconfig' ?



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