On Sun, Dec 17, 2006 at 11:48:34AM +0200, Tshepang Lekhonkhobe wrote: > An off-topic question: why is this Debian kernel limited to 4GB and > why do there have to be an option instead of just setting the whole > thing to 64GB?
There is a slight performance penalty for the 64G support. > Another off-topic question: Is there any one out there running Linux > on over 64GB of RAM, and if so, is there such support in the kernel or > did they have to modify the src themselves? Yes - using a generic kernel, I'm running Debian on a 128GiB box. The limit of 64GiB is a hardware limit for i386, so no kernel options or hacks will help. IA64 supports 1TiB+. Be aware that when using 32 bit code on i386, no process can get more than 3GiB user memory. 32 bit code on x86_64 or IA64 kernels will get close to 4GiB. You need a 64 bit app to get greater than 4G/process. -- Rob
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