Martin Marques wrote:
John R Pierce wrote:
but thats neither here nor there, PAE is a universal issue for any
x86 32bit system with 4GB+ ram, with PAE disabled, the BIOS, PCI, AGP
or PCI-express, etc IO spaces consume anywheres from .5 to 1GB of the
32bit address space. PAE is a hardware workaround implemented in
pretty much all Intel and AMD CPUs made in the last 5+ years, and
allows the OS to access more than 4GB of physical address space. PAE
introduces some hardware overhead because it involves larger page
tables and another level of indirection in the TLB lookups.
CentOS 5 installs defaults to PAE off because there are some systems
where PAE is crash-happy. Someone here has already explained how
to enable PAE and in fact the original poster tried it and is happy
with his full 4GB now.
Well, looks like I'm having quite a bit of a problem then. :-(
I have PAE kernel running, and all I see is 3.2Gb of the 4Gb.
dmidecode gives me this (intel chip):
Handle 0x0000, DMI type 0, 20 bytes.
BIOS Information
Vendor: Intel Corp.
Version: EV91510A.86A.0482.2006.0222.2350
And later this:
Handle 0x0041, DMI type 19, 15 bytes.
Memory Array Mapped Address
Starting Address: 0x00000000000
Ending Address: 0x000C77FFFFF
Range Size: 3192 MB
Physical Array Handle: 0x0040
Partition Width: 0
[snip]
Handle 0x0048, DMI type 17, 27 bytes.
Memory Device
Array Handle: 0x0040
Error Information Handle: 0x003F
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: 2
Locator: J6H2
Bank Locator: CHANNEL B DIMM1
Type: DDR
Type Detail: Synchronous
Speed: 400 MHz (2.5 ns)
Manufacturer: Manufacturer4
Serial Number: SerNum4
Asset Tag: AssetTagNum4
Part Number: PartNum4
Handle 0x0049, DMI type 20, 19 bytes.
Memory Device Mapped Address
Starting Address: 0x000C0000000
Ending Address: 0x000C6FFFFFF
Range Size: 112 MB
Physical Device Handle: 0x0048
Memory Array Mapped Address Handle: 0x0041
Partition Row Position: 2
Interleave Position: 2
Interleaved Data Depth: 2
As you can see, the last 1Gb bank is only used at 11%.
Any ideas on why I can't see all 4Gb?
This thread may be a start: http://lkml.org/lkml/2006/7/26/204
It sounds like this is a problem with this particular chipset.
-- jeremy
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