On Fri, 2004-07-23 at 20:36, Ed Hill wrote:
Hi folks,
Today, I installed FC2 on a dual Opteron-140 with 12Gig RAM. The install would only work if I added "mem=1024M" or similar as a kernel option.
After the install (which went nicely), the system would only boot if less than 4Gig was specified using the kernel option "mem=3900M" or similar. Anything over 4Gig resulted in an immediate re-boot (reset?) within a second or two of the attempted boot.
---- I don't know about FC-3 but I definitely recall discussions in RHL about kernel being compiled without the options for big memory (of course, this applied to the 2.4 kernel and I would suppose kernel compile options are somewhat different with 2.6 kernel.
Craig
That sounds right Craig. In the kernel you have to first activate HIGHMEM, then there are 2 size options in 2.6: 4GB and 64G
I don't have a FC2 box at hand and am in a bit of a hurry but have a look in /boot at the config file for your kernel (if using a kernel installed from and RPM, otherwise .config in /usr/src/linux-2.6) for something like this:
CONFIG_NOHIGHMEM=y # CONFIG_HIGHMEM4G is not set # CONFIG_HIGHMEM64G is not set
and make sure that the last one is activated (in this example it is not, neither is high mem). If it is not, it would explain why it only sees 4GB and you have earned the right to recompile your kernel ;)
Serge
