Subject: Accounting for differences in physical memory performance
To: None <firstname.lastname@example.org>
From: Ken Seefried <email@example.com>
Date: 05/16/2002 02:27:17
Is there a mechanism in the kernel by which particular chunks of physical
memory are given priority for use over others based on some criteria?
On certain architectures (VME Bus systems in general, The Heurikon VME532
and MVME172 in particular), there is relatively fast local memory, and
relatively slow expansion memory.
For example, on the VME532 (NS32532 @ 25MHz), there is 4MB of zero-wait
local memory. On the MVME172 (MC68060 @ 50MHz) that I have, there is 32MB
of (I think) 1-wait local memory. I can add an arbitratry amount of VME
memory, but it's significantly slower than the local memory. BTW...neither
of these is VSB bus memory. That would be faster, but I don't know how much
Is there a way, implimented or theoretical, that would maximize the
performance of systems with different physical memory performance