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Memory size issue with 2Gb/4Gb DIMMs

esstee
Advisor

Memory size issue with 2Gb/4Gb DIMMs

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)
6 REPLIES
Steven E. Protter
Exalted Contributor

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

Shalom,

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

SEP
Steven E Protter
Owner of ISN Corporation
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Vitaly Karasik_1
Honored Contributor

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

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.
esstee
Advisor

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

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-
Vitaly Karasik_1
Honored Contributor

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

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

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

Try update dmidecode.

esstee
Advisor

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

closing this thread.