[Tfug] Memory under reported

[Choprboy]

On Tuesday 17 June 2008 14:15, Terence Rudkin wrote:
> All
>
> I have Hardy, Ubuntu, 8.0.4 kernel   2.6.24-19-generic #1 SMP Wed Jun
> 4.  The system has 4 gigs of Ram installed. But the system reports
> only 3369900.   I upgraded to Hardy in the last few week I know before
> this the memory had be the full 4G.   Any ideas on what may be at
> issue and how to troubleshoot?
>

Most likely.. the kernel you installed. There are several different kernel 
builds for different hardware. The most important distinction, in your case, 
is the standard kernel to the "Big-mem" kernel. The standard kernel has 
support for "up to" 4GB of memeory, split as a maximum of 3GB user space and 
1GB kernel space (having to do with 32bitspace address limitations and prior 
assumptions of use). The big-mem kernel supports 4+GB of memory, the kernel 
doesn;t really need that 1GB, so it gets allocated as user space (at least 
that is my recollection of how it works).

You no doubt previously had the big-mem kernel installed/running and are now 
on the standard kernel. Should be a simple matter of doing a 
yum/apt-get/up2date install kernel-bigmem-1.2.3, whatever your package 
management flavor is, and then rebooting onto the new kernel.

Adrian