topic Re: Memory size issue with 2Gb/4Gb DIMMs in Operating System - Linux

Memory size issue with 2Gb/4Gb DIMMs

esstee — Tue, 11 Jul 2006 07:48:49 GMT

server#1 contains around 8GB RAM.
server#2 contains aroun 2GB RAM.

The board has four DIMM sockets and can physically hold up to four sticks of memory modules, can support upto 16GB. The BIOS versions are same in both server.

But the output of dmidecode displays the memory size is not installed in server#1.

Is there any problem with the high memory support or do i need to adjust the bios settings.
I tried the different memory diag. applications(lshw, acpidump)

Re: Memory size issue with 2Gb/4Gb DIMMs

Steven E. Protter — Tue, 11 Jul 2006 08:54:44 GMT

Shalom,

You may need the hugemem kernel to recognize memory above 4 GB.

SEP

Re: Memory size issue with 2Gb/4Gb DIMMs

Vitaly Karasik_1 — Tue, 11 Jul 2006 09:21:29 GMT

I suggest you to check into BIOS if server recognizes all RAM.
From Linux side (as far as I remember) RHEL smp kernel supports up to 16GB RAM.

Re: Memory size issue with 2Gb/4Gb DIMMs

esstee — Wed, 12 Jul 2006 06:27:45 GMT

thanks for your responses. I am able to get the available mem size of server#1 using cat /proc/meminfo, /proc/kcore.

But i am getting the memory size is not installed through dmidecode output.

u meant, do i have to enable CONFIG_HIGHMEM64G option in the kernel and re-compile the kernel. is this the only way or any alternate we have.

-Thiru-

Re: Memory size issue with 2Gb/4Gb DIMMs

Vitaly Karasik_1 — Wed, 12 Jul 2006 07:13:00 GMT

if you see all RAM in /proc/meminfo, top - in my opinion, everything is OK, i.e. linux kernel uses all RAM.

Re: Memory size issue with 2Gb/4Gb DIMMs

Ryan Goh — Thu, 20 Jul 2006 22:47:51 GMT

Try update dmidecode.

Re: Memory size issue with 2Gb/4Gb DIMMs

esstee — Sun, 23 Jul 2006 22:51:37 GMT

closing this thread.