FC3 max memory

[Alexander Lazarevich]

[root at blah root]# uname -a
Linux blah 2.6.10-1.741_FC3smp #1 SMP Thu Jan 13 16:58:29 EST 2005 x86_64 
x86_64 x86_64 GNU/Linux

Hardware is Tyan 2885 mobo, two opteron 244 procs in it. Right now the 
system has 4GB of memory installed:

[root at hofmann license]# cat /proc/meminfo
MemTotal:      3607440 kB

The mobo takes up to 16GB of memory. But when I add more memory, 4 more 
1GB dimms, 8GB total, same exact type of memory that is already in the 
system (DDR ECC Reg PC2700), the kernel panics and doesn't boot. The error 
is:

<0> kernel panic - not syncing: Attempted to kill the idle task

It dies just before the audit init takes place, so the kernel hardly boots 
at all, if even.

Any idea what the maximum memory is for FC3 with the kernel I have? I 
tried looking for a bigmem kernel but isn't large memory support built in? 
I'm pretty sure support is for much more memory than 4GB. Do I have to 
recompile a special kernel though?

Does anyone have more than 4GB of memory in a FC3 system and NOT have 
kernel panics? What is your kernel?

Thanks,

Alex