From owner-freebsd-net@FreeBSD.ORG Mon Aug 11 07:17:58 2014 Return-Path: Delivered-To: freebsd-net@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 ESMTPS id 22256F98 for ; Mon, 11 Aug 2014 07:17:58 +0000 (UTC) Received: from mail-n.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mail-n.franken.de", Issuer "Thawte DV SSL CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id D11A328B6 for ; Mon, 11 Aug 2014 07:17:57 +0000 (UTC) Received: from [192.168.1.200] (p548195BE.dip0.t-ipconnect.de [84.129.149.190]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTP id 6B7321C0E96E9; Mon, 11 Aug 2014 09:17:52 +0200 (CEST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Subject: Re: A problem on TCP in High RTT Environment. From: Michael Tuexen In-Reply-To: <17A804F3-BEA6-46F4-887F-B68750618FD9@netapp.com> Date: Mon, 11 Aug 2014 09:17:51 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <0CF85443-26AC-4931-9D00-3396C18C7690@lurchi.franken.de> References: <20140809184232.GF83475@funkthat.com> <8AE1AC56-D52F-4F13-AAA3-BB96042B37DD@lurchi.franken.de> <20140809204500.GG83475@funkthat.com> <3F6BC212-4223-4AAC-8668-A27075DC55C2@lurchi.franken.de> <20140810022350.GI83475@funkthat.com> <20140810033212.GL83475@funkthat.com> <17A804F3-BEA6-46F4-887F-B68750618FD9@netapp.com> To: "Eggert, Lars" X-Mailer: Apple Mail (2.1878.6) Cc: "freebsd-net@freebsd.org" , John-Mark Gurney , Niu Zhixiong , Bill Yuan X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Aug 2014 07:17:58 -0000 On 11 Aug 2014, at 09:08, Eggert, Lars wrote: > Hi, >=20 > On 2014-8-10, at 5:48, Niu Zhixiong wrote: >> I am using Intel I350-T4 NIC. >=20 > igb driver? >=20 > I've been having weird issues with this driver under 10-RELEASE, too. = On one machine, I had to limit hw.igb.num_queues=3D2 in order to get any = sort of useful connectivity. On another machine, I had to severely bump = kern.ipc.nmbclusters & friends. I'm not sure this is the issue here, = since SCTP seems to be working OK, but I'm not trusting igb NICs at the = moment. Was there any suspicious output provided by netstat -m when the problems = occur? Best regards Michael >=20 > Lars