My BIOS shows all my RAM, but when I boot up linux it does not see all the
RAM
I have two one GIG sticks of RAM, which show up in my bios, but when
typing free, I see that it only shows 256Megs.
Is there a way to specify the amount of RAM if linux cannot detect this,
or how can I fix/tweak the OS to recognize the amount of RAM
my OS is centos-4-x86_64 on a DELL 1850
[root at smtcorav02 ~ ]# free
total used free shared buffers cached
Mem: 251360 220136 31224 0 3932 64748
-/+ buffers/cache: 151456 99904
Swap: 524280 0 524280
--
Robin Mordasiewicz wrote:> My BIOS shows all my RAM, but when I boot up linux it does not see all > the RAM > > I have two one GIG sticks of RAM, which show up in my bios, but when > typing free, I see that it only shows 256Megs. > > Is there a way to specify the amount of RAM if linux cannot detect this, > or how can I fix/tweak the OS to recognize the amount of RAM > > my OS is centos-4-x86_64 on a DELL 1850 > > [root at smtcorav02 ~ ]# free > total used free shared buffers cached > Mem: 251360 220136 31224 0 3932 64748 > -/+ buffers/cache: 151456 99904 > Swap: 524280 0 524280 > >You can try doing the following: edit grub.conf and append this to the second line "mem=2048M" Of course don't put the quotes in there. I believe this can still be passed to the kernel in such a manner. I'm not sure if you can pass mem=2G of course I suppose you could try it. If you don't want to make any permanent changes until you know it works, simply reboot and at the grub screen hit a key so you can edit. The spacebar should suffice or 'e'. Arrow down to the second line and hit 'e' again and place the above mem statment at the end. HTH Alex White
On Mon, 2005-10-03 at 10:33 -0400, Robin Mordasiewicz wrote:> My BIOS shows all my RAM, but when I boot up linux it does not see all the > RAM > > I have two one GIG sticks of RAM, which show up in my bios, but when > typing free, I see that it only shows 256Megs. > > Is there a way to specify the amount of RAM if linux cannot detect this, > or how can I fix/tweak the OS to recognize the amount of RAM > > my OS is centos-4-x86_64 on a DELL 1850 > > [root at smtcorav02 ~ ]# free > total used free shared buffers cached > Mem: 251360 220136 31224 0 3932 64748 > -/+ buffers/cache: 151456 99904 > Swap: 524280 0 524280 > >Some video cards swipe some ram, maybe this is what you are seeing. I have also seen hardware based agents swipe ram as well. Regards, Ted
Make sure "System Install Mode"(or something close to that) is not
enabled in the bios. If it is enabled, it will limit the system to 256MB of ram
for compatibility of some OS installations.
-----Original Message-----
From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On
Behalf Of Robin Mordasiewicz
Sent: Monday, October 03, 2005 10:34 AM
To: CentOS mailing list
Subject: [CentOS] OS does not see all my RAM
My BIOS shows all my RAM, but when I boot up linux it does not see all the RAM
I have two one GIG sticks of RAM, which show up in my bios, but when typing
free, I see that it only shows 256Megs.
Is there a way to specify the amount of RAM if linux cannot detect this, or how
can I fix/tweak the OS to recognize the amount of RAM
my OS is centos-4-x86_64 on a DELL 1850
[root at smtcorav02 ~ ]# free
total used free shared buffers cached
Mem: 251360 220136 31224 0 3932 64748
-/+ buffers/cache: 151456 99904
Swap: 524280 0 524280
--
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On Mon, Oct 03, 2005 at 10:33:41AM -0400, Robin Mordasiewicz wrote: RM> My BIOS shows all my RAM, but when I boot up linux it does not see all the RM> RAM RM> RM> I have two one GIG sticks of RAM, which show up in my bios, but when RM> typing free, I see that it only shows 256Megs. RM> uname -a ? -- Regards, Alex Antropoff