William,

> The theshold for using PAE is actually far lower than 4GB. 4GB is the
> total memory address space -- split that in half for 2GB for userspace,
> 2GB for kernel. The OS cache resides in kernel space -- after you take
> alway the memory allocation for devices, you're left with a window of
> roughly 900MB.

I'm curious, how do you get 1.1GB for memory allocation for devices?

-- 
Josh Berkus
Aglio Database Solutions
San Francisco

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