From owner-freebsd-current Thu Nov 13 11:19:21 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id LAA09599 for current-outgoing; Thu, 13 Nov 1997 11:19:21 -0800 (PST) (envelope-from owner-freebsd-current) Received: from smtp03.primenet.com (smtp03.primenet.com [206.165.5.84]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id LAA09570 for ; Thu, 13 Nov 1997 11:18:59 -0800 (PST) (envelope-from tlambert@usr08.primenet.com) Received: (from daemon@localhost) by smtp03.primenet.com (8.8.7/8.8.7) id MAA22538; Thu, 13 Nov 1997 12:18:48 -0700 (MST) Received: from usr08.primenet.com(206.165.6.208) via SMTP by smtp03.primenet.com, id smtpd022531; Thu Nov 13 12:18:42 1997 Received: (from tlambert@localhost) by usr08.primenet.com (8.8.5/8.8.5) id MAA29928; Thu, 13 Nov 1997 12:18:38 -0700 (MST) From: Terry Lambert Message-Id: <199711131918.MAA29928@usr08.primenet.com> Subject: Re: Intel Pentium Bug: BSDI Releases a patch (fwd) To: chris@netmonger.net (Christopher Masto) Date: Thu, 13 Nov 1997 19:18:38 +0000 (GMT) Cc: freebsd-current@FreeBSD.ORG In-Reply-To: <64fa86$bbu$1@schenectady.netmonger.net> from "Christopher Masto" at Nov 13, 97 04:35:18 pm X-Mailer: ELM [version 2.4 PL23] Content-Type: text Sender: owner-freebsd-current@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk > 'LOW PAGE' is unmapped, 'HIGH PAGE' is mapped. So Linux will see > a 'bounced exception' in the page fault handler only if exceptions 0-6 > happen ... they are very rare. The BSDI fix seems to cut at exception > 13, which thus includes important exceptions like the lazy-FPU exception. > Linux does not have this overhead. Why do they do it at 13 if they don't have to? What did Intel tell them that they didn't tell us that makes them willing to take the additional 7 IDT entry hit? Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.