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Date:      Tue, 4 Feb 1997 20:24:12 -0500
From:      "David S. Miller" <davem@jenolan.rutgers.edu>
To:        nate@mt.sri.com
Cc:        julian@whistle.com, toor@dyson.iquest.net, michaelh@cet.co.jp, freebsd-smp@freebsd.org
Subject:   Re: [?] TLB Flushing on Context Switch PPro vs. Pentium
Message-ID:  <199702050124.UAA03391@jenolan.caipgeneral>
In-Reply-To: <199702050105.SAA09082@rocky.mt.sri.com> (message from Nate Williams on Tue, 4 Feb 1997 18:05:24 -0700 (MST))

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   Date: Tue, 4 Feb 1997 18:05:24 -0700 (MST)
   From: Nate Williams <nate@mt.sri.com>

   > 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.)

Ifdef'd out by default in 2.0.x, if enabled in that code it can then
be dynamically disabled via the mem=nopentium boot time command line
option.

In 2.1.x it is completely enabled.



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