Peter Kjellstrom wrote:
On Monday 22 January 2007 17:05, Matt wrote:
What are advantages of 64 bit OS anyway? I was thinking with i386 the
max RAM you could have was like 4 gigabyte or something? 64 bit
allows quite a bit more, right?
You can have alot of RAM even in a 32-bit system. However, there is also the
issue of efficiency and applications being able to actually use alot of
memory. Here are some random bits of information on the subject:
* you can have alot more than 4G on 32-bit with pae (hugemem kernels)
* ...but, already at ~900M 32-bit has to start using highmem
* ...which can cause problems for (old and badly designed) applications
already at ~900M
* 32-bit EL kernels have 4K kernel stacks, 64-bit has 8K, affects eg. XFS
I am upgrading a very heavilly used email server to a AMD64 dual core
with CentOS. I am staying with i386 since the web GUI we use lists
64bit support as beta and I do not want any problems.
Not a bad choice, software functionality is probably one of the biggest
differences between 32- and 64-bit.
/Peter
Somebody feel free to slap me upside the head if I'm wrong, but as I
understand it,
you can utilize up to 16GB on the standard SMP kernel. The bigmem
kernel allows
up to 64GB, IIRC.
I have no idea the RAM limits on the x86_64 kernel. Didn't look.
Peter
--
Peter Serwe <peter at infostreet dot com>
http://www.infostreet.com
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"There are two things no man will admit he cannot do well: drive and make love." -Sir Stirling Moss
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