[rhn-users] grub does not honor mem=xxxMrequest

[Lazarev, Roman]

What you might have bumped into something we dealt with. You installed a
32-bit version of RHEL4 onto AMD processor. Anaconda tried to be too
smart and detected your stone as Athlon, rather than Opteron and the
wrong kernel got installed, since Athlons don't support more than 4GB by
definition hence your situation. You can inspect what architecture your
kernel was compiled for using:

rpm -q --qf "RPM: %{NAME}-%{VERSION}-%{RELEASE} Arch:%{ARCH}\n" kernel
(just if you didn't know `rpm --querytags`)

Also look in `cat /proc/cpuinfo` - how was your stone detected?

Then re-install kernel for 64-bit AMD proc and you should be all set.

Roman Lazarev
Fidelity Investment Management Technology
245 Summer Street V2E
Boston, MA 02210
(617) 563-1173


-----Original Message-----
From: rhn-users-bounces at redhat.com [mailto:rhn-users-bounces at redhat.com]
On Behalf Of Benj FitzPatrick
Sent: Tuesday, January 17, 2006 11:53 AM
To: Red Hat Network Users List
Subject: Re: [rhn-users] grub does not honor mem=xxxMrequest


I believe bigmem is the default for AMD64 SMP, just like NUMA
is.  Also, as I said, I have 4 other computers which work just
fine with 4+ GB, so it is something with the memory remapping
on this mobo and the kernel.

---- Original message ----
>Date: Tue, 17 Jan 2006 05:27:01 -0800
>From: "Brian T. Brunner" <brian.t.brunner at gai-tronics.com>  
>Subject: Re: [rhn-users] grub does not honor mem=xxxMrequest  
>To: <rhn-users at redhat.com>
>
>
>IIRC the 3GB limit is there unless you're using a
BIGMEM-enabled kernel.
>More than 3GB may be seen by various places but won't be used
by the kernel.
>
>Brian Brunner
>brian.t.brunner at gai-tronics.com
>(610)796-5838
>
>>>> benjfitz at uchicago.edu 01/16/06 06:10PM >>>
>Okies, perhaps I should give a little more info.  I have 4
>other computers running RHEL 4.  1 with 8GB and 3 with 4GB,
>and none of these has this problem.  I looked at cat
>/proc/meminfo and it is seeing the same amount of RAM that
>grub is.  Any ideas?
>
>---- Original message ----
>>Date: Sat, 14 Jan 2006 08:12:01 -0500
>>From: jludwig <wralphie at comcast.net>  
>>Subject: Re: [rhn-users] grub does not honor mem=xxxM request  
>>To: Red Hat Network Users List <rhn-users at redhat.com>
>>
>>On Thursday 12 January 2006 17:14, Benj FitzPatrick wrote:
>>> I have a dual opteron 275 box (iwill dk8x and 8x512MB of
>>> reg/ecc pc3200) with RHEL 4 AS installed.  I have the latest
>>> kernel (2.6.9-22.0.1.ELsmp.  It shows 3.09GB of RAM in top.  I
>>> have changed the software and hardware memory remap functions
>>> in the BIOS and software on/hardware off gives 4096MB of NVRAM
>>> during POST.  However, top still shows 3.09GB (with and
>>> without mem=4096M in the boot line).  Am I using this option
>>> incorrectly or is there something else I can do?
>>>
>>> _______________________________________________
>>> rhn-users mailing list
>>> rhn-users at redhat.com 
>>> https://www.redhat.com/mailman/listinfo/rhn-users 
>>Apologies wrong icon -- mad mouse loose -- 
>>Had to check, but, /proc/meminfo should tell what the kernel
>is actually 
>>seeing. 
>>
>>I did not look at top but suspect it may have some
>limitations on its memory 
>>display unless it gets the information from /proc.
>>
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