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DateTue, 21 Apr 1998 14:03:42 +0200
FromMartin Mares <>
SubjectRe: Maturity of PCI_OPTIMIZE in 2.0.33
Hi,

> It is listed as EXPERIMENTAL, but _how_ experiental is it? Is it stable to
> use it on a production system and exactly what does it optimize?

It sets several parameters related to CPU-to-PCI bridging (posted writes,
writeback caching etc.) on several chipsets. It has positive impact on speed
on the following chipsets and only when BIOS forgets to set it itself:

UMC 8891A
UMC 8881F
Intel Mercury/Neptune/Saturn

In general, unless you have one of these chipsets, it has no effect
at all. If you don't have a lazy BIOS, it has no effect even if you have
such chipset and if you have a lazy BIOS, it possibly could break some
things. So preferably don't turn it on.

Have a nice fortnight
--
Martin `MJ' Mares <mj@ucw.cz> http://atrey.karlin.mff.cuni.cz/~mj/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
"If at first you don't succeed, redefine success."

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