Messages in this thread |  | | | Date | Fri, 25 Jul 1997 11:56:41 +0200 (MET DST) | | From | Ingo Molnar <> | | Subject | Re: About ioremap() and L2-Cache |
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On Fri, 25 Jul 1997, Alan Cox wrote:
> > Asus' Award bios docs mention that enabling write-combining might crash > > the 'puter... Is enabling write combining supported under Linux? ;) > > (don't exactly want to set "dangerous" options in bios... 'due cmos > > changes might be one-way only in some situations...) > > [any other stuff I should know about ppro's under Linux?] > > Write combining is the sort of thing you want to enable from user space as it > breaks a few video cards and works wonderously well on most. You can do this > as root under iopl(3);
no i think you need real ring0 access, not iopl(3). But there is already an apropriate patch for Linux at:
http://ikcbarka.fzk.de/~martin/proform.html
it's a kernel module to set MTRR's. Reports say it seriously boosts XFree 3.3 on PPro's.
-- mingo
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