Only 938MB of RAM recognized , no HIGHMEM Option in kernel

Message

sebulba128 · Post by **sebulba128** » Tue Jan 17, 2006 5:34 pm

Hello Guys,

i have a laptop with 1GB of RAM but only 938 MB recognized, i have gentoo-sources (2.6.15-r1) inbstalled , but i cannot find the HIGHMEM Option in the kernel. Is this option removed in he new kernel versions ? If tried many configs and with no personal .config - File but the option is not available

thx for the answers , sebulba128[/code]

frostschutz · Post by **frostschutz** » Tue Jan 17, 2006 6:19 pm

'make menuconfig', search for highmem using '/' and typing in HIGHMEM. Most likely you'll find it under 'Processor type and features'.

sebulba128 · Post by **sebulba128** » Tue Jan 17, 2006 6:48 pm

thank you for the reply, i have done this before, but only one option available in Kernel Debugging , but not the right one i need. in "Section Processortype and features" is nothing like HGHMEM, i can remember previous version where the option was there, but now it is gone

dweigert · Post by **dweigert** » Tue Jan 17, 2006 6:48 pm

Ummmm
For AMD64 chips and running a 64 bit kernel, no highmem is needed.

However, there may be a BIOS otion for remapping memory. I believe that is what may be happening to you.

Dan

sebulba128 · Post by **sebulba128** » Wed Jan 18, 2006 8:50 am

no option in my BIOS, it's a quite weak BIOS from PHOENIX.....still searching for the problem

jsrlepage · Post by **jsrlepage** » Wed Jan 18, 2006 6:43 pm

maybe it's just the integrated graphics array?

nxsty · Post by **nxsty** » Wed Jan 18, 2006 7:31 pm

Some memory might be reserved for the graphic card.

sebulba128 · Post by **sebulba128** » Wed Jan 18, 2006 7:42 pm

I have a seperate Mobility Radeon 9700 with its own 128MB of Graphics RAM

energyman76b · Post by **energyman76b** » Wed Jan 18, 2006 11:09 pm

and you are using a 64bit kernel?

Memory: 1027964k/1048256k available (1947k kernel code, 19612k reserved, 943k data, 156k init

says my 64bit kernel without any 'highmem' or other 32bit hacks kernel (2.6.16-rc1, but this is true for all kernels since 2.6.13-somewhat)

deepspace9 · Post by **deepspace9** » Wed Jan 18, 2006 11:49 pm

Your BIOS might need some memory adresses for IRQ's. usually it takes a range above the used memory, but on some boards (I'v had the same with my Tyan K7X pro dual Athlon board) map it just below 1 GB. So you lose a bit of memory there.

sebulba128 · Post by **sebulba128** » Thu Jan 19, 2006 12:31 am

I'm using a 64-bit kernel for my Mobile Athlon64

i think that it is a BIOS problem