From owner-cvs-src@FreeBSD.ORG Sat Oct 25 14:33:02 2003 Return-Path: Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 26CF416A4B3; Sat, 25 Oct 2003 14:33:02 -0700 (PDT) Received: from mail.chesapeake.net (chesapeake.net [208.142.252.6]) by mx1.FreeBSD.org (Postfix) with ESMTP id CD43843FE0; Sat, 25 Oct 2003 14:33:00 -0700 (PDT) (envelope-from jroberson@chesapeake.net) Received: from localhost (jroberson@localhost) by mail.chesapeake.net (8.11.6/8.11.6) with ESMTP id h9PLX0H04536; Sat, 25 Oct 2003 17:33:00 -0400 (EDT) (envelope-from jroberson@chesapeake.net) Date: Sat, 25 Oct 2003 17:33:00 -0400 (EDT) From: Jeff Roberson To: Peter Wemm In-Reply-To: <200310251851.h9PIpfS1065265@repoman.freebsd.org> Message-ID: <20031025173220.D43805-100000@mail.chesapeake.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: cvs-src@FreeBSD.org cc: src-committers@FreeBSD.org cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/i386 pmap.c X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 25 Oct 2003 21:33:02 -0000 On Sat, 25 Oct 2003, Peter Wemm wrote: > peter 2003/10/25 11:51:41 PDT > > FreeBSD src repository > > Modified files: > sys/i386/i386 pmap.c > Log: > For the SMP case, flush the TLB at the beginning of the page zero/copy > routines. Otherwise we run into trouble with speculative tlb preloads > on SMP systems. This effectively defeats Jeff's revision 1.438 > optimization (for his pentium4-M laptop) in the SMP case. It breaks > other systems, particularly athlon-MP's. If the page tables are NULL why does this break speculative tlb preloads? > > Revision Changes Path > 1.450 +13 -0 src/sys/i386/i386/pmap.c >