Re: Athlon Optimization Problem

[Calin A. Culianu]

You can view a pseudo-spec (basically a wpcredit .pcr file) for the
kt266/kt266a northbridges by hitting this link:
http://www.rtlab.org/kt266-kt266a-northbridge-spec.txt.  This does say
that 0x95.5,6,7 are the memory write queue timer bits...

It is still an open question whether or not setting these to off actually
do more harm than good in the pci-pc.c patch, but we can at least be sure
that 0x95 is the right register.

Alan tells me that basically 0x95.5, 0x95.6, and 0x95.7 being turned off
have done more harm than good.  In all my tests those bits being turned
off has done more good than harm.  :/ What to do?

-Calin

On Tue, 29 Jan 2002, Calin A. Culianu wrote:

> On Tue, 29 Jan 2002, Daniel Nofftz wrote:
>
> > On Mon, 28 Jan 2002, Calin A. Culianu wrote:
> >
> > > Hmm.  What do you recommend?  I remember seeing a spec sheet and register
> > > 0x95 was the memory write queue timer.. but I could have dreamed it..
> > >
> > > Anyone know what register 0x95 does?
> >
> > hmmm ... when i was working on the athlon disconnect patch i found that
> > the pcr files (resorce files) for the wpcredit programm (windows tool for
> > changing the configuration of chipset) are a good source of information.
> > but this register isn't discribed in this file ... sorry
> >
> > daniel
> > (i placed the pcr file on the web, if you are interested, have a look at:
> > http://cip.uni-trier.de/nofftz/linux/kt266_pcr.txt ... the webserver is
> > down at the moment, but should be up again in 1-2 hours)
>
> Thank you kindly, Daniel.  It's strange that register 95 is ommitted.  We
> definitely can conclude that register 55 is not the one to set on the
> kt266 motherboards (whereas on the other via motherboards it *is* the one
> to set...  I even have the spec sheet to prove it! :) )
>
> I really wish VIA were more willing to cooperate with us and give us spec
> sheets.  It's to their advantage to have us make their buggy motherboards
> work well with linux, for crying out loud!  I really don't get what the
> big deal is.  I mean it's not like the concept of setting bytes on a pci
> device to change functionality is so revolutionary it deserves to be
> obfuscated...
>
> -Calin
>
> -
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