Date: Sat, 4 Aug 2001 03:00:02 -0300 (BRST) From: Rik van Riel <riel@conectiva.com.br> To: Terry Lambert <tlambert2@mindspring.com> Cc: Julian Elischer <julian@elischer.org>, craig <craiglei@pasia.com.cn>, <freebsd-hackers@FreeBSD.ORG> Subject: Re: How to visit physical memory above 4G? Message-ID: <Pine.LNX.4.33L.0108040259020.2526-100000@imladris.rielhome.conectiva> In-Reply-To: <3B6B8EAC.B4EBD5E8@mindspring.com>
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On Fri, 3 Aug 2001, Terry Lambert wrote: > You still haven't told me what Linux does for 2x4G processes > and a 1G kernel with "only" 8G of physical RAM. I rather > suspect that as soon as your usage exceeds real memory, it > all goes to hell very quickly, since your L1 and L2 caches > are effectively disabled by the frequent reloading of CR3 > and CR4 on context switches... Page tables can point to pages all over memory, there is no need to use stupid segment tricks for anything. regards, Rik -- Virtual memory is like a game you can't win; However, without VM there's truly nothing to lose... http://www.surriel.com/ http://distro.conectiva.com/ Send all your spam to aardvark@nl.linux.org (spam digging piggy) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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