[K12OSN] 4GB memory limit?

Thu Jan 3 18:32:49 UTC 2008

Quite a few of us out here are using the EL releases.  Right now, I'm
typing this using K12LTSP 4.2EL, and just last week, I did my yum
update, which pulled down all the new CentOS 4.6 updates.  If this is a
new deployment, you would do very well to go with the 5.0EL release.

--TP
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Michael Blinn wrote:
> 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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>
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