From owner-cvs-all@FreeBSD.ORG Tue Sep 30 01:20:14 2003 Return-Path: Delivered-To: cvs-all@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 087D216A4B3; Tue, 30 Sep 2003 01:20:14 -0700 (PDT) Received: from mail.chesapeake.net (chesapeake.net [208.142.252.6]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4A23043FFB; Tue, 30 Sep 2003 01:20:10 -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 h8U8K9a24801; Tue, 30 Sep 2003 04:20:09 -0400 (EDT) (envelope-from jroberson@chesapeake.net) Date: Tue, 30 Sep 2003 04:20:09 -0400 (EDT) From: Jeff Roberson To: Jeff Roberson In-Reply-To: <200309300811.h8U8BaAQ061807@repoman.freebsd.org> Message-ID: <20030930041512.X99666-100000@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/kern kern_synch.c src/sys/sys proc.h src/sys/i386/i386 genassym.c pmap.c swtch.s src/sys/i386/include pcb.h X-BeenThere: cvs-all@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the entire tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Sep 2003 08:20:14 -0000 This improved my 'make kernel' times by 2%. The effect was less with buildkernel since we spent so much of our time waiting on IO, etc. For an operation like pmap_zero_page() the TLB flush is probably half of the cost of the function. On Tue, 30 Sep 2003, Jeff Roberson wrote: > jeff 2003/09/30 01:11:36 PDT > > FreeBSD src repository > > Modified files: > sys/kern kern_synch.c > sys/sys proc.h > sys/i386/i386 genassym.c pmap.c swtch.s > sys/i386/include pcb.h > Log: > - On my Pentium4-M laptop, invalpg takes ~1100 cycles if the page is found in > the TLB and ~1600 if it is not. Therefore, it is more effecient to > invalidate the TLB after operations that use CMAP rather than before. > - So that the tlb is invalidated prior to switching off of a processor, we > must change the switchin functions to switchout functions. > - Remove td_switchout from the thread and move it to the x86 pcb. > - Move the code that calls switchout into swtch.s. These changes make this > optimization truely x86 specific. > > Revision Changes Path > 1.143 +1 -1 src/sys/i386/i386/genassym.c > 1.438 +33 -33 src/sys/i386/i386/pmap.c > 1.143 +6 -1 src/sys/i386/i386/swtch.s > 1.50 +2 -1 src/sys/i386/include/pcb.h > 1.234 +0 -8 src/sys/kern/kern_synch.c > 1.348 +0 -1 src/sys/sys/proc.h >