Date: Mon, 21 Feb 2005 07:42:17 -0700 From: Scott <scottl@samsco.org> To: Petri Helenius <pete@he.iki.fi> Cc: freebsd-hackers@freebsd.org Subject: Re: 4M page size Message-ID: <4219F349.8010106@samsco.org> In-Reply-To: <4219EC1D.7020401@he.iki.fi> References: <4219EC1D.7020401@he.iki.fi>
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Petri Helenius wrote: > > Is there a way currently to utilize 4M page size with FreeBSD for large > data set programs (to optimize TLB misses)? > > Pete > FreeBSD/i386 uses 4MB pages to hold the kernel text and data, but there is no way (to my knowledge) to ask the pmap layer for a 4MB page after that either from the kernel or from userland. However, it's also my understanding that most non-Xeon CPUs only have a 4kb TLB, and 4MB pages are just broken down into 4kb chunks for it. Scott
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