On Mon, Jun 04, 2007 at 11:14:40AM -0400, Tom Moore wrote: > I am having some difficulty trying to get my 4Gb of ram recognized by > the system. I have tried googling around to get some information on how > to do this configuration, but I have come up dry. I suspect that the > reason that there is not much info on how to set things up is because > usually it just works. However, on my system I don't think it is. > > By the way, I am not subscribed to this mailing list, so could you > please CC me any replies. > > The basics are that I have an Athlon 64 X2 Dual core, 4Gb ram, ASUS > M2N-MX motherboard. The bios has a configuration item for MTRR mapping, > with options for CONTINUOUS and DISCRETE. I have selected CONTINUOUS, > which explicitly describes the PCI hole as non-cacheable. The other > option leaves the PCI hole undescribed. > > My config has selected > CONFIG_HIGHMEM4G=y
That supports of to 4GB memory space. > free -m reports the following.... > total used free shared buffers cached > Mem: 2906 2794 112 0 275 31 > -/+ buffers/cache: 2487 419 > Swap: 4996 366 4630 > > > /proc/mtrr contains the following.... > > reg00: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1 > reg01: base=0x100000000 (4096MB), size=1024MB: write-back, count=1 > reg02: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1 Your memory map however has 3GB at address 0 and 1GB at address 4GB (so memory is places at address 0 - 3GB and 4-5GB. The addresses from 3 to 4GB are reserved for PCI). If you run a 64bit kernel you will see it all, or you can use a kernel configured for 64GB memory space. > Relevant bootup messages include these.... > Jun 3 13:50:52 fawkes Linux version 2.6.20-gentoo-r8 ([EMAIL PROTECTED]) > (gcc > version 4.1.1 (Gentoo 4.1.1-r3)) #6 SMP Tue May 15 10:18:59 EDT 2007 > Jun 3 13:50:52 fawkes BIOS-provided physical RAM map: > Jun 3 13:50:52 fawkes sanitize start > Jun 3 13:50:52 fawkes sanitize end > Jun 3 13:50:52 fawkes copy_e820_map() start: 0000000000000000 size: > 000000000009fc00 end: 000000000009fc00 type: 1 > Jun 3 13:50:52 fawkes copy_e820_map() type is E820_RAM > Jun 3 13:50:52 fawkes copy_e820_map() start: 000000000009fc00 size: > 0000000000000400 end: 00000000000a0000 type: 2 > Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000000e0000 size: > 0000000000020000 end: 0000000000100000 type: 2 > Jun 3 13:50:52 fawkes copy_e820_map() start: 0000000000100000 size: > 00000000b7ec0000 end: 00000000b7fc0000 type: 1 > Jun 3 13:50:52 fawkes copy_e820_map() type is E820_RAM > Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000b7fc0000 size: > 000000000000e000 end: 00000000b7fce000 type: 3 > Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000b7fce000 size: > 0000000000022000 end: 00000000b7ff0000 type: 4 > Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000b7ff0000 size: > 0000000000010000 end: 00000000b8000000 type: 2 > Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000fec00000 size: > 0000000000001000 end: 00000000fec01000 type: 2 > Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000fee00000 size: > 0000000000100000 end: 00000000fef00000 type: 2 > Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000ff780000 size: > 0000000000880000 end: 0000000100000000 type: 2 > Jun 3 13:50:52 fawkes copy_e820_map() start: 0000000100000000 size: > 0000000040000000 end: 0000000140000000 type: 1 > Jun 3 13:50:52 fawkes copy_e820_map() type is E820_RAM > Jun 3 13:50:52 fawkes BIOS-e820: 0000000000000000 - 000000000009fc00 > (usable) > Jun 3 13:50:52 fawkes BIOS-e820: 000000000009fc00 - 00000000000a0000 > (reserved) > Jun 3 13:50:52 fawkes BIOS-e820: 00000000000e0000 - 0000000000100000 > (reserved) > Jun 3 13:50:52 fawkes BIOS-e820: 0000000000100000 - 00000000b7fc0000 > (usable) > Jun 3 13:50:52 fawkes BIOS-e820: 00000000b7fc0000 - 00000000b7fce000 > (ACPI data) > Jun 3 13:50:52 fawkes BIOS-e820: 00000000b7fce000 - 00000000b7ff0000 > (ACPI NVS) > Jun 3 13:50:52 fawkes BIOS-e820: 00000000b7ff0000 - 00000000b8000000 > (reserved) > Jun 3 13:50:52 fawkes BIOS-e820: 00000000fec00000 - 00000000fec01000 > (reserved) > Jun 3 13:50:52 fawkes BIOS-e820: 00000000fee00000 - 00000000fef00000 > (reserved) > Jun 3 13:50:52 fawkes BIOS-e820: 00000000ff780000 - 0000000100000000 > (reserved) > Jun 3 13:50:52 fawkes BIOS-e820: 0000000100000000 - 0000000140000000 > (usable) > Jun 3 13:50:52 fawkes Warning only 4GB will be used. > Jun 3 13:50:52 fawkes Use a PAE enabled kernel. Oh look, it even tells you right there that you have to use a PAE (>4GB for 32bit machines) kernel to get all your ram. -- Len Sorensen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
