From owner-freebsd-bugs@FreeBSD.ORG Tue Jun 21 08:30:19 2005 Return-Path: X-Original-To: freebsd-bugs@hub.freebsd.org Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 65A3416A41C for ; Tue, 21 Jun 2005 08:30:19 +0000 (GMT) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2720943D53 for ; Tue, 21 Jun 2005 08:30:19 +0000 (GMT) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.13.3/8.13.3) with ESMTP id j5L8UIR3015997 for ; Tue, 21 Jun 2005 08:30:18 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.13.3/8.13.1/Submit) id j5L8UIVE015996; Tue, 21 Jun 2005 08:30:18 GMT (envelope-from gnats) Resent-Date: Tue, 21 Jun 2005 08:30:18 GMT Resent-Message-Id: <200506210830.j5L8UIVE015996@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Pieter de Boer Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id BB4E916A41C for ; Tue, 21 Jun 2005 08:21:53 +0000 (GMT) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (www.freebsd.org [216.136.204.117]) by mx1.FreeBSD.org (Postfix) with ESMTP id A3AFB43D49 for ; Tue, 21 Jun 2005 08:21:53 +0000 (GMT) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.13.1/8.13.1) with ESMTP id j5L8LrsQ014983 for ; Tue, 21 Jun 2005 08:21:53 GMT (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.13.1/8.13.1/Submit) id j5L8Lrdx014982; Tue, 21 Jun 2005 08:21:53 GMT (envelope-from nobody) Message-Id: <200506210821.j5L8Lrdx014982@www.freebsd.org> Date: Tue, 21 Jun 2005 08:21:53 GMT From: Pieter de Boer To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-2.3 Cc: Subject: kern/82470: FreeBSD advertises wrong window scale in some situations X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Jun 2005 08:30:19 -0000 >Number: 82470 >Category: kern >Synopsis: FreeBSD advertises wrong window scale in some situations >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Jun 21 08:30:18 GMT 2005 >Closed-Date: >Last-Modified: >Originator: Pieter de Boer >Release: 5.4-RELEASE >Organization: SNB@UvA >Environment: FreeBSD client.wind.surfnet.nl 5.4-RELEASE FreeBSD 5.4-RELEASE #0: Thu Jun 16 17:09:33 CEST 2005 root@:/usr/obj/usr/src/sys/SMP i386 >Description: Setting a recv buffer of (65535*2)+1 lets FreeBSD advertise a window of 65535<<2 (window scale 2, 256KB) in stead of 65535<<1 (window scale 1, 128KB). So FreeBSD is advertising a window bigger than the actual available receive space. When setting the buffer to 65535*2 exactly, the window scale option is set correctly. >How-To-Repeat: sysctl net.inet.tcp.recvspace=131071 Then set up a connection from the FreeBSD system to something else. FreeBSD will advertise a windowsize of 256KB, although there's only 1 byte more than 128KB available. >Fix: Haven't had time to look into it yet, sorry. >Release-Note: >Audit-Trail: >Unformatted: