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?
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