Debian etch and memory issues with a PE 2950

[Robert Goley]

As long as you are not using iptables or the XFS filesystem, you can 
compile/install a 64 bit kernel.  That would allow you to use all memory more 
effectively.  You may even see some minor speed improvements.  The reasons 
for not using iptables or XFS have to do with issues using 32 bit runtime 
applications with a 64 bit kernel implementation.  I have successfully done 
this for a while using a Sarge installation.  It is much easier to do with 
Etch.

Robert

On Monday 18 February 2008 10:29, Pau Montero Parés wrote:
> Hello!
>
> I have a PE2950 working with a Debian Etch with kernel 2.6.18-6-686.
> The server has 4GB RAM but kernel only reports this:
>
> # dmesg | grep kernel
> Memory: 3371012k/3407520k available (1541k kernel code, 35256k
> reserved, 580k data, 196k init, 2490016k highmem)
> Freeing unused kernel memory: 196k freed
>
> I tried to bypass the RAM detection using the grub parameter
> "mem=4000M" without luck.
>
> Several days ago and before doing a security kernel update, the
> servers said that:
>
> # dmesg | grep -n kernel
> 11:Use a PAE enabled kernel.
> 80:Memory: 3364876k/4194304k available (1541k kernel code, 41388k
> reserved, 576k data, 196k init, 2490016k highmem)
> 428:Freeing unused kernel memory: 196k freed
> 641:BUG: warning at kernel/cpu.c:51/unlock_cpu_hotplug()
> 646:BUG: warning at kernel/cpu.c:51/unlock_cpu_hotplug()
>
> Any ideas about how can I solve this problem and use the whole RAM?
> Thanks a lot.