Received: by mail.netbsd.org (Postfix, from userid 605) id 50B1B84D37; Fri, 22 Nov 2019 23:36:26 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mail.netbsd.org (Postfix) with ESMTP id C8FE884D32 for ; Fri, 22 Nov 2019 23:36:25 +0000 (UTC) X-Virus-Scanned: amavisd-new at netbsd.org Received: from mail.netbsd.org ([127.0.0.1]) by localhost (mail.netbsd.org [127.0.0.1]) (amavisd-new, port 10025) with ESMTP id TXQfMueeYzWS for ; Fri, 22 Nov 2019 23:36:25 +0000 (UTC) Received: from cvs.NetBSD.org (ivanova.netbsd.org [199.233.217.197]) by mail.netbsd.org (Postfix) with ESMTP id 6AE4084CDF for ; Fri, 22 Nov 2019 23:36:25 +0000 (UTC) Received: by cvs.NetBSD.org (Postfix, from userid 500) id 64AD4FA97; Fri, 22 Nov 2019 23:36:25 +0000 (UTC) Content-Disposition: inline Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" MIME-Version: 1.0 Date: Fri, 22 Nov 2019 23:36:25 +0000 From: "Andrew Doran" Subject: CVS commit: src/sys/arch To: source-changes@NetBSD.org X-Mailer: log_accum Message-Id: <20191122233625.64AD4FA97@cvs.NetBSD.org> Sender: source-changes-owner@NetBSD.org List-Id: source-changes.NetBSD.org Precedence: bulk Reply-To: source-changes-d@NetBSD.org Mail-Reply-To: "Andrew Doran" Mail-Followup-To: source-changes-d@NetBSD.org List-Unsubscribe: Module Name: src Committed By: ad Date: Fri Nov 22 23:36:25 UTC 2019 Modified Files: src/sys/arch/amd64/amd64: locore.S src/sys/arch/x86/x86: cpu.c Log Message: - On-demand zeroing pages with MOVNTI is crazy. It empties L1/L2/L3. - Disable zeroing in the idle loop. That needs a cache-friendly strategy. Result: 3 to 4% reduction in kernel build time on my test system. Inspired by a discussion with Mateusz Guzik and David Maxwell. To generate a diff of this commit: cvs rdiff -u -r1.191 -r1.192 src/sys/arch/amd64/amd64/locore.S cvs rdiff -u -r1.174 -r1.175 src/sys/arch/x86/x86/cpu.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.