[K12OSN] 4GB memory limit?

[Michael Blinn]

The RAM issue is a limitation of physical address space in 32-bit 
systems. You have two options to get around it: Run 64-bit kernel (if 
processor supports it) or run the bigmem kernel, which implements PAE 
(Physical address extensions). There is a performance hit associated 
with using PAE, however I'm not sure of the specifics. I shouldn't 
expect it to be really noticeable unless you're on a loaded server. You 
may want to pass a mem=4GB kernel boot options and see if that makes a 
difference. - Perhaps PAE (bigmem) is slowing you down a lot?

And yes, I would suggest using CentOS as FC6 is already EOL.

Cheers,
  Michael

Shawn Powers wrote:
> I remember having to use a bigmem kernel a while back to get support 
> for my 6GB of RAM in my 32 bit xeon server, but for some reason I 
> though K12LTSP 6.0 had support for it with the SMP kernel.  Maybe I'm 
> doing it wrong...
>
> That said, I installed K12LTSP v6 over Christmas break (updating from 
> my FC1 version, whatever it was), and today has been a nightmare!  
> Everything is so darn slow...  I'm using xfce, without the session 
> manager (it caused crashes), but everything about the systems are 
> slow.  (I installed 2 servers, identical hardware, and firefox is 
> being very stubborn)
>
> I'm considering installing 5.0.0EL, especially since FC6 is about to 
> die... or maybe it's already EOL, I'm not sure.
>
> Pay no attention to the man lamenting in the latter half of that 
> email, but I'm curious about the bigmem issue -- anyone have any ideas?
>
> Thanks,
> -Shawn
>
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