Pe 1950 and missing ram

[jeff nichols]

sounds like the PCIe "memory hole". 
The way I understand it is the top of lowmem addresses are being reserved for 'critical' PC subsystems (PCIe is the biggest hog). The memory is still there, but above the addressable memory space of the 32-bit kernel. 

The fix is to run 64-bit or use a kernel that can address memory above 4gb (hugemem).

reference:
http://support.intel.com/support/motherboards/server/sb/CS-010458.htm
http://lists.us.dell.com/pipermail/linux-poweredge/2006-August/026795.html
http://www.uwsg.iu.edu/hypermail/linux/kernel/0607.3/1787.html





> ----- Original Message -----
> From: "Stephen John Smoogen" <smooge at gmail.com>
> To: "Claudio De Luca" <claudio at serverplan.com>
> Subject: Re: Pe 1950 and missing ram
> Date: Mon, 10 Sep 2007 16:21:57 -0600
> 
> 
> On 9/10/07, Claudio De Luca <claudio at serverplan.com> wrote:
> >
> >
> > Hi
> >
> > i have a Pe 1950 with 4 gb of ram on Centos 5.0 but it show only 3290Mb
> >
> >              total       used       free     shared    buffers     cached
> > Mem:          3290       2951        338          0        169       1110
> > -/+ buffers/cache:       1672       1618
> > Swap:         8001        128       7872
> >
> >
> > dmidecode | grep 1024
> >
> >         ROM Size: 1024 kB
> >         Size: 1024 MB
> >         Size: 1024 MB
> >         Size: 1024 MB
> >         Size: 1024 MB
> >
> > this problem is present only on centos 5, previus release show full ram
> > range
> >
> 
> Problem is due to way big mem is handled between the EL-4 and EL-5
> kernels. You need to use bigmem or 64 bit kernel if you want to see
> all of the 4GB on your system.
> 
> --
> Stephen J Smoogen. -- CSIRT/Linux System Administrator
> How far that little candle throws his beams! So shines a good deed
> in a naughty world. = Shakespeare. "The Merchant of Venice"
> 
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