Bill Davidsen wrote:
Langdon Stevenson wrote:
Roger Heflin wrote:
Néstor wrote:
I have a situation where I have 36 Gigs of ram on a machine and I
could only
see 4 Gigs
then I installed the PAE kernel and I can only see 24 Gigs. I have
a ticket
opened with
Red Hat to see what they recommend.
:-)
If that is a 64-bit capable machine, you should run 64-bit on it, you
can run 32-bit userspace stuff, but if you run a 32-bit os with that
kind of ram you run into all sorts of issues with the machine running
out of the 800-900MB of lowmem and this causes fatal issues even
those massive amounts of highmem are available. You will have
enough issues with 32-bit and lots of ram to make it worth
considering the 64-bit stuff.
Roger
I recently upgraded from F7 to F8 and went with the 32 bit F8 version
rather than the 64 F7 due to the significant difficulties I had with
FireFox/Flash/Java.
I had installed another 2 Gig of RAM just prior to the upgrade and it
showed up fine under F7 64bit.
However on F8 32bit I can only see 3.2 gig of my RAM. It is not a
huge problem as I don't use it all. The 64 version of F7 used to
gobble up all of my RAM occasionally (I could never figure out why, or
what application was responsible). That problem vanished with the 32
bit F8 and 32 bit apps.
It is interesting though that when the 64 v's 32 bit question has been
asked on this list that I have never heard this memory limit mentioned
(I may have missed it though). Perhaps it is just that RAM is now
soooooo cheap that it is only just becoming an issue.
Still. Looks like a really good reason to go with 64 bit next time I
do an upgrade!
I didn't get all my RAM even with 64 bit, so don't bet the farm on it
working.
The problem is the MB maker has 2 choices:
Maximize the amount of ram below the 4GB line and waste .5-.75 GB of ram and
maximize the amount of ram usable for 32-bit windows, OR
Maximize the total amount of ram for 64-bit, but make 32-bit windows potentially
see 1-2GB of ram less (this one is never chose because most run 32-bit windows)
And/OR put in an option to select between Linux and windows, usually this was
done on the high-end dual socket boards (but not on the dual-socket desktop type
boards), I don't think it was ever done on any of the single socket stuff.
And often on the high end boards there is also someplace a memory-mapping option
of (none,software,hardware), and each of the 3 different options can show
different amount of ram, and each of the 3 can make a fair difference in
performance (one MB choosing one over the other make a 5% diff in specFP results).
Roger
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