Messages in this thread |  | | Date | Fri, 29 Dec 2000 17:54:36 +0000 (GMT) | From | Mark Hemment <> | Subject | Re: test13-pre5 |
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On Fri, 29 Dec 2000, Tim Wright wrote: > Yes, this is a very important point if we ever want to make serious use > of large memory machines on ia32. We ran into this with DYNIX/ptx when the > P6 added 36-bit physical addressing. Conserving KVA (kernel virtual address > space), became a very high priority. Eventually, we had to add code to play > silly segment games and "magically" materialize and dematerialize a 4GB > kernel virtual address space instead of the 1GB. This only comes into play > with really large amounts of memory, and is almost certainly not worth the > agony of implementation on Linux, but we'll need to be careful elsewhere to > conserve it as much as possible.
Indeed. I'm compiling my kernels with 2GB virtual. Not as I want more NORMAL pages in the page cache (HIGH memory is fine), but as I need NORMAL pages for kernel data/structures (memory allocated from slab-caches) which need to be constantly mapped in.
Mark
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