From: ron minnich <rminnich@lanl.gov>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] pathetic
Date: Wed, 25 Feb 2004 09:02:45 -0700 [thread overview]
Message-ID: <Pine.LNX.4.44.0402250900080.9147-100000@maxroach.lanl.gov> (raw)
In-Reply-To: <20040225154145.G7383@edinburgh.cisco.com>
On Wed, 25 Feb 2004, Derek Fawcus wrote:
> As I understand it, this NX bit is at the page level, and so can alter
> a individual 4K page within the linear memory space. If they used the
> segment facility to do this, the memory space would be non linear and
> on the x86 this'd take a massive performance hit (48 bit addresses).
well ... on e.g. linux, the segment descriptors are used. Paging on x86 is
in addition to segments. segment are earlier in address translation path
than pages, and they are still there when paging is turned on. It's quite
weird.
I don't see an NX bit in my pentium manual.
ron
next prev parent reply other threads:[~2004-02-25 16:02 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-25 15:26 ron minnich
2004-02-25 15:41 ` Derek Fawcus
2004-02-25 16:02 ` ron minnich [this message]
2004-02-26 1:15 ` Derek Fawcus
2004-02-26 3:45 ` ron minnich
2004-02-26 4:12 ` Derek Fawcus
2004-02-26 6:48 ` boyd, rounin
2004-02-26 6:41 ` boyd, rounin
2004-02-25 16:26 ` Aharon Robbins
2004-02-26 6:02 ` boyd, rounin
2004-02-26 10:41 ` Douglas A. Gwyn
2004-02-26 11:32 ` Charles Forsyth
2004-02-26 11:33 ` Geoff Collyer
2004-02-26 12:39 ` Dave Lukes
2004-02-26 12:11 ` boyd, rounin
2004-02-26 13:42 ` dbailey27
2004-02-26 14:36 ` ron minnich
2004-02-26 14:41 ` David Presotto
2004-02-26 14:40 ` dbailey27
2004-02-26 14:47 ` ron minnich
2004-02-26 14:44 ` dbailey27
2004-02-26 15:28 ` ron minnich
2004-02-26 15:38 ` George Michaelson
2004-02-26 16:16 ` ron minnich
2004-02-26 17:32 ` [9fans] SPF+SMTP C H Forsyth
2004-03-01 10:34 ` [9fans] pathetic Vin McLellan
2004-02-26 15:38 ` dbailey27
2004-02-26 14:58 ` andrey mirtchovski
2004-02-26 15:53 ` dbailey27
2004-02-27 9:01 ` boyd, rounin
2004-02-27 10:52 ` Geoff Collyer
2004-02-27 13:07 ` David Presotto
2004-02-27 20:26 ` Lyndon Nerenberg
2004-02-27 22:22 ` Tristan Seligmann
2004-02-27 23:36 ` Geoff Collyer
2004-02-27 13:42 ` Dave Lukes
2004-02-27 15:42 ` a
2004-02-27 17:45 ` 9nut
2004-02-27 23:10 ` boyd, rounin
2004-02-29 21:11 ` boyd, rounin
2004-02-26 15:16 ` C H Forsyth
2004-02-26 15:37 ` Dave Lukes
2004-02-26 17:55 ` jmk
2004-02-26 19:23 ` Richard Miller
2004-02-26 19:35 ` jmk
2004-02-26 19:50 ` Richard Miller
2004-02-27 11:04 ` Dan Moniz
2004-02-26 20:46 ` boyd, rounin
2004-02-26 15:37 ` Derek Fawcus
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