[PlanetCCRMA] 4GBs of ram with 32-bit ccrma

sevol sevol at inwa.net
Fri Aug 29 17:49:57 PDT 2008

Jim Robinson wrote:
> Hey Sevol,
> That is weird. Maybe the stock CCRMA kernel does have a lower limit - I 
> have never checked.
> I would suggest installing a PAE kernel and see if it reports more 
> memory.  That will at least tell you if it's software or hardware related.
> As root on your system run:
> yum install kernel-PAE
> This will install the stock Fedora PAE kernel.  Then reboot and when you 
> get the splash screen hit the down arrow to get in then select the PAE 
> kernel and hit enter.  This should boot up and let you know if it's 
> something in the Kernel you were using.  This is not a CCRMA kernel so I 
> don't think you'll get the preemptive stuff so this is only for 
> testing.  If it makes the PAE default you can change that in /etc/grub.conf
> If the PAE gives you all the memory then we need to check if the CCRMA 
> repo will give you a PAE version. If anyone is watching this thread and 
> knows if there is a patched CCRMA PAE kernel let us know....
> Once you get that in - paste the results of these two commands back and 
> that should give us what we need.
> uname -r
> free
Hi Jim,

This is the output of the commands using the Fedora PAE kernel, followed 
by output of same commands under the ccrmart kernel:

[sevol at localhost ~]$ uname -r
[sevol at localhost ~]$ free
              total       used       free     shared    buffers     cached
Mem:       3886480     489716    3396764          0      18728     322828
-/+ buffers/cache:     148160    3738320
Swap:      4096532          0    4096532

[sevol at localhost ~]$ uname -r
[sevol at localhost ~]$ free
              total       used       free     shared    buffers     cached
Mem:       3081676     498236    2583440          0      18352     322212
-/+ buffers/cache:     157672    2924004
Swap:      4096532          0    4096532

With your help - for one, the "free" command is new to me - I'm getting 
somewhere, if only in the area of trying to understand this :) On my 
system at least, the 4GB limit doesn't seem to apply to the ccrmart 
kernel. I wonder why?

If I'm getting this, I guess the question is - like you said - is there 
a patched PAE-enabled CCRMA kernel out there?

Thanks again,
> Jim
> sevol wrote:
>> Jim Robinson wrote:
>>> As far as I am aware a regular Kernel can address up to 4Gb of ram 
>>> but if you go over the 4Gb you would need the PAE kernel.
>>> Out of interest does the BIOS report 4Gb at post time?  Do you have a 
>>> built-on-the-motherboard video card that is assigned memory from the 
>>> system RAM pool perhaps?
>>> Jim
>> Thanks for the reply. I couldn't find a memory size listing in the 
>> BIOS, but Memtest shows 3839M. BTW, it's a GIGABYTE GA-MA78G-DS3H 
>> motherboard with on-board video. & in fact, in the BIOS I did allocate 
>> 256MB of ram to video. If there was that amount of memory missing, I 
>> guess I'd have thought, OK, that's where the missing ram is being 
>> used. But I can't figure out the discrepancy. The ram is OCZ Reaper 
>> HPC Edition, Model OCZ2RPR800C44GK:
>> http://www.newegg.com/Product/Product.aspx?Item=N82E16820227267
>> (hmm... before getting this ram I thought I read in the customer 
>> reviews where a few Linux people were using it. I don't see anything 
>> now, but that may or may not matter.)
>> Anything else I can try?
>>         -sevol
>>> sevol wrote:
>>>> Hi People,
>>>> Recently I put together a new box with 4 gigs (2x2GB sticks) of ram. 
>>>> Under the kernel only 2.94GBs is 
>>>> showing up. Is it possible to gain the full 4GBs of ram with this 
>>>> kernel? My cpu is 64-bit, & initially, I tried a fc9 64-bit install. 
>>>> When the install disc failed to recognize my hard drive, I backed 
>>>> off to a 32-bit OS on fc8. (Anyway, not sure my heart was ready for 
>>>> the move to 64-bit.)
>>>> My searching indicates that a pae-enabled kernel is required for 
>>>> accessing all the system ram via a 32-bit OS. & the ccrmart kernel 
>>>> isn't pae-enabled, is it? Am I wrong on this, or missing some info 
>>>> to get things working? Are people able to utilize 4GBs of physical 
>>>> ram with a 32-bit ccrma kernel? Or will I need to switch to a 64-bit 
>>>> OS?
>>>> Any insight would be much welcome.
>>>> I have to say, I'm completely incompetent with audio work in general 
>>>> & certainly with Linux audio, but also, I'd like to say now, many 
>>>> thanks to Fernando Lopez-Lezcano for releasing Planet CCRMA's great 
>>>> software package collection.
>>>> best,
>>>>         -sevol
>>>> _______________________________________________
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>>>> http://ccrma-mail.stanford.edu/mailman/listinfo/planetccrma
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