Date: Mon, 07 Dec 1998 21:08:45 +0000 From: Karl Pielorz <kpielorz@tdx.co.uk> To: "Kenneth D. Merry" <ken@plutotech.com> Cc: "Ron G. Minnich" <rminnich@Sarnoff.COM>, hackers@FreeBSD.ORG Subject: Re: write combining memory on pci Message-ID: <366C43DD.A7DA16F4@tdx.co.uk> References: <199812072105.OAA07499@panzer.plutotech.com>
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"Kenneth D. Merry" wrote: > > Ron G. Minnich wrote... > > any good ideas on how to turn this on in 3.0 for a given memory address > > range? > > Isn't there usually a BIOS option to do that? I think it's called USWC or > something like that. (Uniform Speculative Write Combining?) I don't think > it generally covers a specific address range, though. Both my P-Pro systems have this option, and AFAIK it worked as above (i.e. 'all on' or 'all off')... Win NT survives with it on, until I try to use the sound card, and FreeBSD, Linux & Win'95 all die within seconds with it on... Which is a bit of a pitty, as I also seem to remember reading it gives a huge performance win on writes ;-) - Maybe there is such a thing as 'too fast'... <G> -Kp To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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