Date: Tue, 4 Feb 1997 18:05:24 -0700 (MST) From: Nate Williams <nate@mt.sri.com> To: Julian Elischer <julian@whistle.com> Cc: "John S. Dyson" <toor@dyson.iquest.net>, Michael Hancock <michaelh@cet.co.jp>, freebsd-smp@freebsd.org Subject: Re: [?] TLB Flushing on Context Switch PPro vs. Pentium Message-ID: <199702050105.SAA09082@rocky.mt.sri.com> In-Reply-To: <32F79F16.41C67EA6@whistle.com> References: <199702041147.GAA05042@dyson.iquest.net> <32F79F16.41C67EA6@whistle.com>
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> > > The PPro doesn't automatically flush the TLB on context switch like the > > > Pentium did. What else does the PPro do differently? > > > > > On the non-SMP kernel, we specifically set the PG_G flag that > > keeps the kernel pages in the TLB on PPro. I have also been > > playing with the idea of using 4MB pages (which the P5 also > > unofficially supports.) > > I believe linux now does this. I know Linus toyed with this, but ended up going back due to bugs in many Pentium chips. (My Pentium will not work with 4MB pages, and it's a P100 w/out the FDIV bug.) Nate
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