Why can I not see all 4gb of RAM?

[SupaRice]

Hi,

How come if I actually have 4gb of memory installed in my box, I can't see it all?

root@fs01:~# uname -r
2.6.8-3-686

root@fs01:~# cat /proc/meminfo
MemTotal: 2856864 kB
MemFree: 1024668 kB
Buffers: 117088 kB
Cached: 1553536 kB
SwapCached: 0 kB
Active: 126500 kB
Inactive: 1565792 kB
HighTotal: 1965760 kB
HighFree: 1020160 kB
LowTotal: 891104 kB
LowFree: 4508 kB
SwapTotal: 3903752 kB
SwapFree: 3903752 kB
Dirty: 4 kB
Writeback: 0 kB
Mapped: 35304 kB
Slab: 128136 kB
Committed_AS: 83528 kB
PageTables: 596 kB
VmallocTotal: 114680 kB
VmallocUsed: 5532 kB
VmallocChunk: 108948 kB
root@fs01:~#

root@fs01:~# cat /boot/config-2.6.8-3-686 | grep CONFIG_HIGHMEM4G
CONFIG_HIGHMEM4G=y

[antidrugue]

Does the BIOS sees it all ? What kind of machine is that ? Did you try a newer kernel ?

[SupaRice]

Does the BIOS sees it all ? What kind of machine is that ? Did you try a newer kernel ?

Yeah, BIOS sees it all, so does Windoze if I use it. It's an ASUS motherboard in a machine that I built. Should I try an SMP kernel, it's only got a single P4 processor?

[Zelmo]

Maybe the kernel isn't configured for more than 1GB.
What do you get from this command?

cat /boot/config* | grep HIGHMEM

[antidrugue]

Maybe the kernel isn't configured for more than 1GB.

I'm afraid it is :

root@fs01:~# cat /boot/config-2.6.8-3-686 | grep CONFIG_HIGHMEM4G
CONFIG_HIGHMEM4G=y

About this :

Should I try an SMP kernel, it's only got a single P4 processor?

If that CPU is hyperthreading enabled, yes you should use a SMP kernel. Then again, trying another kernel is what you should do anyway.

[SupaRice]

If that CPU is hyperthreading enabled, yes you should use a SMP kernel. Then again, trying another kernel is what you should do anyway.

OK, tried the SMP kernel, get the same results....


root@fs01:~# uname -r
2.6.8-3-686-smp

root@fs01:~# cat /proc/meminfo
MemTotal: 2856380 kB
MemFree: 2654912 kB
Buffers: 123208 kB
Cached: 40060 kB
SwapCached: 0 kB
Active: 38840 kB
Inactive: 134884 kB
HighTotal: 1965760 kB
HighFree: 1910272 kB
LowTotal: 890620 kB
LowFree: 744640 kB
SwapTotal: 3903752 kB
SwapFree: 3903752 kB
Dirty: 24 kB
Writeback: 0 kB
Mapped: 20912 kB
Slab: 16212 kB
Committed_AS: 70352 kB
PageTables: 500 kB
VmallocTotal: 114680 kB
VmallocUsed: 5252 kB
VmallocChunk: 109176 kB

root@fs01:~# cat /boot/config-2.6.8-3-686-smp | grep CONFIG_HIGHMEM4G
CONFIG_HIGHMEM4G=y


Any ideas?

[antidrugue]

You can try to pass the mem boot parameter in GRUB :

mem=4096M