On Sunday 02 April 2006 02:04, kashani wrote:
I've made my problem go away, but I'm a bit curious about why it was
happening.
I've got nine or so Dell 1850's with 2 x 2GB chips. When I compile
gentoo-source 2.6.15-r1 (and 2.6.14-r5) with support for 4GB I see only
3GB. 1GB lowmem and 2GB highmem.
ws04 ~ # cat /proc/meminfo
MemTotal: 3107408 kB
MemFree: 1731660 kB
Buffers:219720 kB
Cached: 937980 kB
SwapCached: 0 kB
Active: 455100 kB
Inactive: 717924 kB
HighTotal: 2227968 kB
HighFree: 1271588 kB
When I recompile on the same hardware with support for 64GB RAM I see
the full 4GB in the usual 1GB/3GB split.
nms02 ~ # cat /proc/meminfo
MemTotal: 4147776 kB
MemFree: 3762712 kB
Buffers:151404 kB
Cached: 45116 kB
SwapCached: 0 kB
Active: 56724 kB
Inactive: 145000 kB
HighTotal: 3276544 kB
HighFree: 3222936 kB
However on my HP DL360 with 4 x 1GB RAM I see the 4GB, though it's a bit
smaller, with 4GB enabled in the kernel. Same kernel version as the Dell's.
[EMAIL PROTECTED] ~ $ cat /proc/meminfo
MemTotal: 3977744 kB
MemFree:116792 kB
Buffers:296108 kB
Cached:3157952 kB
SwapCached: 0 kB
Active:2725152 kB
Inactive: 782956 kB
HighTotal: 3096552 kB
HighFree: 8680 kB
I've been Googling around for an explantion, but am not really sure what
I'm looking for. I'd assume that I might lose a few hundred MB if the 2
x 2GB chips are slightly bigger than the 4GB limit rather than the full
1GB that seems to disappear. I'm guessing some wacky motherboard
interleaving thing where highmem ends up being one chip and the lowmem
the 896MB on the other chip.
Anyone have a decent theory on this with a nice link?
kashani
Enabling 4GB support instead of 1 will allow 4GB of ram, _not_ =4GB.
To be sure you can use all of it you have to select 64GB at the kernel.
The reason it does work for your DL360 is because the bios works around the
problem for you.
--
Rick van Hattem Rick.van.Hattem(at)Fawo.nl
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