SUMMARY:VAC - what is it?

From: Andy McCammont (mccammaa@expt05.stp.xfi.bp.com)
Date: Thu Feb 23 1995 - 06:22:50 CST

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I got a couple of replys to my posting asking what the line in
/var/adm/messages:
vmunix: VAC ENABLED in COPYBACK mode
meant.

It's avirtual address cache, which is enabled on multiprocessor
machines, as opposed to a Physical Address Cache (PAC) which is used on
single CPU machines.
It's CPU h/w dependant, and the kernel picks the mode at startup - it
can't be set.

Thanks to frans@kiwi6.uia.ac.be (Francois Staes) and 1 other (sorry I
lost you mail) for this info

--
Andy McCammont
mccammaa@expt05.stp.xfi.bp.com
pgp key on request, key id 1024/A24B6995

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