RE: 8gb memory on Redhat AS 2.1

From: Pankaj Govil <pgovil(at)chipublib.org>
Date: Fri Oct 12 2007 - 14:28:05 EDT

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

Thx,

Pankaj Govil

-----Original Message-----
From: redhat-list-bounces@redhat.com
[mailto:redhat-list-bounces@redhat.com] On Behalf Of Steve Phillips Sent: Tuesday, October 09, 2007 1:07 AM
To: tony.delov@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
4gb?
>
> 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' ?

--
Steve.

--
Steve.

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Received on Fri Oct 12 14:39:02 2007