From owner-freebsd-bugs@FreeBSD.ORG Wed May 21 23:20:01 2008 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E877A106566B for ; Wed, 21 May 2008 23:20:01 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id C88E58FC1B for ; Wed, 21 May 2008 23:20:01 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.14.2/8.14.2) with ESMTP id m4LNK1H4090539 for ; Wed, 21 May 2008 23:20:01 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.2/8.14.1/Submit) id m4LNK1Ao090538; Wed, 21 May 2008 23:20:01 GMT (envelope-from gnats) Resent-Date: Wed, 21 May 2008 23:20:01 GMT Resent-Message-Id: <200805212320.m4LNK1Ao090538@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, Tom Karpik Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 360E3106564A for ; Wed, 21 May 2008 23:19:44 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (www.freebsd.org [IPv6:2001:4f8:fff6::21]) by mx1.freebsd.org (Postfix) with ESMTP id 279B78FC19 for ; Wed, 21 May 2008 23:19:44 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.14.2/8.14.2) with ESMTP id m4LNIJA8045653 for ; Wed, 21 May 2008 23:18:19 GMT (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.14.2/8.14.1/Submit) id m4LNIJVn045652; Wed, 21 May 2008 23:18:19 GMT (envelope-from nobody) Message-Id: <200805212318.m4LNIJVn045652@www.freebsd.org> Date: Wed, 21 May 2008 23:18:19 GMT From: Tom Karpik To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Cc: Subject: kern/123881: Turning on TCP blackholing causes slow localhost connections 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: Wed, 21 May 2008 23:20:02 -0000 >Number: 123881 >Category: kern >Synopsis: Turning on TCP blackholing causes slow localhost connections >Confidential: no >Severity: serious >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed May 21 23:20:01 UTC 2008 >Closed-Date: >Last-Modified: >Originator: Tom Karpik >Release: 7.0-RELEASE >Organization: >Environment: FreeBSD OsirisBSD 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Sun Feb 24 19:59:52 UTC 2008 root@logan.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386 >Description: Turning on TCP blackholing (sysctl net.inet.tcp.blackhole=2) seems to make connecting to some local services very slow. Example: telnet localhost 25 (default local Sendmail daemon after fresh installation of FreeBSD) Sendmail responds with its greeting string right away if blackholing is off. If it's turned on, it takes about 8-12 seconds for the greeting to show up. >How-To-Repeat: sysctl net.inet.tcp.blackhole=2 (or 1) telnet localhost 25 >Fix: sysctl net.inet.tcp.blackhole=0 >Release-Note: >Audit-Trail: >Unformatted: