Why can I not see all 4gb of RAM?

11-27-2006	#1 (permalink)
SupaRice Just Joined! Join Date: Oct 2006 Posts: 13	Why can I not see all 4gb of RAM? 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

11-27-2006	#2 (permalink)
antidrugue Linux Guru Join Date: Oct 2005 Location: Montreal, Canada Posts: 3,213	Does the BIOS sees it all ? What kind of machine is that ? Did you try a newer kernel ? __________________ "To express yourself in freedom, you must die to everything of yesterday. From the 'old', you derive security; from the 'new', you gain the flow." -Bruce Lee

11-27-2006

#3 (permalink)

SupaRice

Just Joined!

Join Date: Oct 2006

Posts: 13

Quote:

Originally Posted by antidrugue

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?

11-28-2006	#4 (permalink)
Zelmo Linux Engineer Join Date: Jan 2006 Location: Riverton, UT, USA Posts: 1,001	Maybe the kernel isn't configured for more than 1GB. What do you get from this command? Code: cat /boot/config* \| grep HIGHMEM __________________ Stand up and be counted as a Linux user!

11-28-2006

#5 (permalink)

antidrugue

Linux Guru

Join Date: Oct 2005

Location: Montreal, Canada

Posts: 3,213

Quote:

Originally Posted by Zelmo

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

I'm afraid it is :

Quote:

Originally Posted by SupaRice

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

About this :

Quote:

Originally Posted by SupaRice

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.

__________________
"To express yourself in freedom, you must die to everything of yesterday. From the 'old', you derive security; from the 'new', you gain the flow."

-Bruce Lee

11-28-2006

#6 (permalink)

SupaRice

Just Joined!

Join Date: Oct 2006

Posts: 13

Quote:

Originally Posted by antidrugue

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?

11-28-2006	#7 (permalink)
antidrugue Linux Guru Join Date: Oct 2005 Location: Montreal, Canada Posts: 3,213	You can try to pass the mem boot parameter in GRUB : Code: mem=4096M __________________ "To express yourself in freedom, you must die to everything of yesterday. From the 'old', you derive security; from the 'new', you gain the flow." -Bruce Lee