From owner-svn-doc-head@FreeBSD.ORG Thu Oct 9 01:44:21 2014 Return-Path: Delivered-To: svn-doc-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id B1BCE558; Thu, 9 Oct 2014 01:44:21 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 83D67CC7; Thu, 9 Oct 2014 01:44:21 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id s991iLRf046508; Thu, 9 Oct 2014 01:44:21 GMT (envelope-from wblock@FreeBSD.org) Received: (from wblock@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id s991iL5a046507; Thu, 9 Oct 2014 01:44:21 GMT (envelope-from wblock@FreeBSD.org) Message-Id: <201410090144.s991iL5a046507@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: wblock set sender to wblock@FreeBSD.org using -f From: Warren Block Date: Thu, 9 Oct 2014 01:44:21 +0000 (UTC) To: doc-committers@freebsd.org, svn-doc-all@freebsd.org, svn-doc-head@freebsd.org Subject: svn commit: r45753 - head/en_US.ISO8859-1/htdocs/news/status X-SVN-Group: doc-head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-doc-head@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: SVN commit messages for the doc tree for head List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 09 Oct 2014 01:44:21 -0000 Author: wblock Date: Thu Oct 9 01:44:20 2014 New Revision: 45753 URL: https://svnweb.freebsd.org/changeset/doc/45753 Log: Add libcsse report. Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2014-07-2014-09.xml Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2014-07-2014-09.xml ============================================================================== --- head/en_US.ISO8859-1/htdocs/news/status/report-2014-07-2014-09.xml Wed Oct 8 22:37:42 2014 (r45752) +++ head/en_US.ISO8859-1/htdocs/news/status/report-2014-07-2014-09.xml Thu Oct 9 01:44:20 2014 (r45753) @@ -1019,4 +1019,47 @@ commit bits were taken in for safe keeping.

+ + + SSE variants of libc routines for amd64 + + + + + John + Baldwin + + jhb@FreeBSD.org + + + + + + + + +

I have written SSE/AVX-optimized versions of a few libc + routines for amd64. So far the list includes memcpy, + memset, and strlen. For each routine I have + written a simple regression test as well as performed some + simple microbenchmarks on various AMD and Intel CPUs.

+ +

The simplest routine is strlen which appears to be a + general win in microbenchmarks. memcpy and + memset have proven trickier as different variants can + behave quite differently on different CPUs.

+ +

At present, I do not yet have a patch relative to libc. Once + I do, this will be suitable for more testing. I'd like to see + some real-world benchmarks that show measurable improvement + before pushing any of this up into the tree.

+ + + + +

Create a branch that holds a modified libc and is suitable + for testing

+ + +