New server advice - quad core any special settings needed?
gmccullagh at gmail.com
Wed Aug 29 09:27:12 BST 2007
On Wed, 29 Aug 2007, Krsnendu dasa wrote:
> I'll be starting with 4 GB of RAM, (possibly increasing it in future.) Which
> kernel should I use?
As 32-bit machines usually address memory on a 32-bit address space, if you
have more than 2^32 bits of memory (about 4GB), you run out of addresses
and can't use the remaining RAM. Actually, PCI devices must also be mapped
into the 32-bit address space which usually leaves you with more like
If you're using a 32-bit kernel, you can either use:
- the -generic- which will usually use a little over 3GB (4GB minus some
address space used by the pci devices)
- the -server- which should use the full memory (using PAE), but at some
If you use a 64-bit kernel, just using the standard -generic- kernel will
allow you to address 2^64 bytes, so you don't need to worry about memory
limits. The only thing is that fully 64-bit systems are relatively new and
still have some issues, usually with proprietary software (eg. there is no
adobe flash plugin or acrobat reader for 64-bit). You can if you wish do
more complex things to run 32-bit apps on a 64-bit system.
I'm not sure what the issues are with WINE and 64-bit but it seems likely
a 32-bit windows app will need to run in 32-bit mode on linux.
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