From owner-svn-src-all@FreeBSD.ORG Tue Oct 15 21:28:52 2013 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 778D843B; Tue, 15 Oct 2013 21:28:52 +0000 (UTC) (envelope-from emax@FreeBSD.org) 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)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 6576D29EB; Tue, 15 Oct 2013 21:28:52 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.7/8.14.7) with ESMTP id r9FLSqPW011834; Tue, 15 Oct 2013 21:28:52 GMT (envelope-from emax@svn.freebsd.org) Received: (from emax@localhost) by svn.freebsd.org (8.14.7/8.14.5/Submit) id r9FLSqTl011833; Tue, 15 Oct 2013 21:28:52 GMT (envelope-from emax@svn.freebsd.org) Message-Id: <201310152128.r9FLSqTl011833@svn.freebsd.org> From: Maksim Yevmenkin Date: Tue, 15 Oct 2013 21:28:52 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r256563 - head/sys/net X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Oct 2013 21:28:52 -0000 Author: emax Date: Tue Oct 15 21:28:51 2013 New Revision: 256563 URL: http://svnweb.freebsd.org/changeset/base/256563 Log: In the flowtable scanner, restart the scan at the last found position, not at position 0. Changes the scanner from O(N^2) to O(N). Submitted by: scottl Obtained from: Netflix, Inc MFC after: 3 weeks Modified: head/sys/net/flowtable.c Modified: head/sys/net/flowtable.c ============================================================================== --- head/sys/net/flowtable.c Tue Oct 15 21:08:37 2013 (r256562) +++ head/sys/net/flowtable.c Tue Oct 15 21:28:51 2013 (r256563) @@ -1401,7 +1401,7 @@ fle_free(struct flentry *fle, struct flo static void flowtable_free_stale(struct flowtable *ft, struct rtentry *rt) { - int curbit = 0, count; + int curbit = 0, count, tmpsize; struct flentry *fle, **flehead, *fleprev; struct flentry *flefreehead, *flefreetail, *fletmp; bitstr_t *mask, *tmpmask; @@ -1410,6 +1410,7 @@ flowtable_free_stale(struct flowtable *f flefreehead = flefreetail = NULL; mask = flowtable_mask(ft); tmpmask = ft->ft_tmpmask; + tmpsize = ft->ft_size; memcpy(tmpmask, mask, ft->ft_size/8); /* * XXX Note to self, bit_ffs operates at the byte level @@ -1479,7 +1480,9 @@ flowtable_free_stale(struct flowtable *f bit_clear(mask, curbit); FL_ENTRY_UNLOCK(ft, curbit); bit_clear(tmpmask, curbit); - bit_ffs(tmpmask, ft->ft_size, &curbit); + tmpmask += (curbit / 8); + tmpsize -= (curbit / 8) * 8; + bit_ffs(tmpmask, tmpsize, &curbit); } count = 0; while ((fle = flefreehead) != NULL) {