Date: Thu, 14 Aug 1997 15:33:13 -0500 (EST) From: dyson@iquest.net To: ulbright@cs.washington.edu (Christopher Ulbright) Cc: smp@FreeBSD.ORG Subject: Re: DISABLE_PSE Message-ID: <19970814203314.12114.qmail@iquest7.iquest.net> In-Reply-To: <Pine.OSF.3.96.970814102605.31249C-100000@sanjuan.cs.washington.edu> from "Christopher Ulbright" at Aug 14, 97 10:30:19 am
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> > Hello, > > Can anyone explain the function of the code within the pmap_bootstrap > function in pmap.c which is prefaced by "#if !defined(DISABLE_PSE)"? > > I'm curious what are the ramifications if DISABLE_PSE is defined and this > code isn't executed. > The PSE option (ability of the more advanced Intel chips) allows for entire 4MB (or 2MB) regions to be mapped at once. This conserves the usage of TLB entries, and makes a marginal performance improvement. John
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