From owner-cvs-src-old@FreeBSD.ORG Mon Apr 18 17:43:33 2011 Return-Path: Delivered-To: cvs-src-old@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id AB799106570B for ; Mon, 18 Apr 2011 17:43:33 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from repoman.freebsd.org (repoman.freebsd.org [IPv6:2001:4f8:fff6::29]) by mx1.freebsd.org (Postfix) with ESMTP id 98E348FC15 for ; Mon, 18 Apr 2011 17:43:33 +0000 (UTC) Received: from repoman.freebsd.org (localhost [127.0.0.1]) by repoman.freebsd.org (8.14.4/8.14.4) with ESMTP id p3IHhXJA022215 for ; Mon, 18 Apr 2011 17:43:33 GMT (envelope-from jhb@repoman.freebsd.org) Received: (from svn2cvs@localhost) by repoman.freebsd.org (8.14.4/8.14.4/Submit) id p3IHhXGK022214 for cvs-src-old@freebsd.org; Mon, 18 Apr 2011 17:43:33 GMT (envelope-from jhb@repoman.freebsd.org) Message-Id: <201104181743.p3IHhXGK022214@repoman.freebsd.org> X-Authentication-Warning: repoman.freebsd.org: svn2cvs set sender to jhb@repoman.freebsd.org using -f From: John Baldwin Date: Mon, 18 Apr 2011 17:43:16 +0000 (UTC) To: cvs-src-old@freebsd.org X-FreeBSD-CVS-Branch: HEAD Subject: cvs commit: src/sys/netinet tcp_output.c X-BeenThere: cvs-src-old@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: **OBSOLETE** CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Apr 2011 17:43:33 -0000 jhb 2011-04-18 17:43:16 UTC FreeBSD src repository Modified files: sys/netinet tcp_output.c Log: SVN rev 220794 on 2011-04-18 17:43:16Z by jhb When checking to see if a window update should be sent to the remote peer, don't force a window update if the window would not actually grow due to window scaling. Specifically, if the window scaling factor is larger than 2 * MSS, then after the local reader has drained 2 * MSS bytes from the socket, a window update can end up advertising the same window. If this happens, the supposed window update actually ends up being a duplicate ACK. This can result in an excessive number of duplicate ACKs when using a higher maximum socket buffer size. Reviewed by: bz MFC after: 1 month Revision Changes Path 1.177 +8 -0 src/sys/netinet/tcp_output.c