I upgraded an older system's version of seamonkey today and noticed that
it was causing some swapping. I had 2G of RAM, but the system can take
up to 4G.
I plugged it in and indeed, the bios tells me that 4G is present.
However when I boot, the kernel does not find it all.
The system is a 10 year old 686 and from dmesg:
DMI: Dell Inc. Precision WorkStation 370 /0 M3849, BIOS A04 03/16/2005
[ 0.000000] 887MB LOWMEM available.
[ 0.000000] mapped low ram: 0 - 377fe000
[ 0.000000] low ram: 0 - 377fe000
[ 0.000000] Zone PFN ranges:
[ 0.000000] DMA 0x00000010 -> 0x00001000
[ 0.000000] Normal 0x00001000 -> 0x000377fe
[ 0.000000] HighMem 0x000377fe -> 0x000bfe8a
[ 0.000000] Memory: 3112504k/3144232k available (3678k kernel code,
31280k reserved, 1423k data, 340k init,
2234928k highmem)
In other words, Linux only sees 3112504k. I suspect a kernel
misconfiguration, but what?
I know the kernel is old (3.4.1) and I can update that, but I should
also be able to use that kernel version for this system.
The config is at
http://anduin.linuxfromscratch.org/~bdubbs/files/config-3.4.1-4
I do have CONFIG_HIGHMEM4G=y but don't think CONFIG_HIGHMEM64G is
needed. In any case I tried changing this and got no change in
available memory.
I did try a commercial distro (SuSE) to see if they do any better, but
they didn't. Am I just stuck with 76% of installed memory?
I will note that the 3G of memory did solve the swapping, but I should
be able to access all the memory.
I also explored the BIOS a bit and hyper-threading was turned off
somehow. I reset it on and that helped the browser responsiveness a bit.
-- Bruce
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