From owner-freebsd-net@FreeBSD.ORG  Mon Aug 11 19:59:45 2014
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id C4F923EE
 for <freebsd-net@freebsd.org>; Mon, 11 Aug 2014 19:59:45 +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 7B21C2B2B
 for <freebsd-net@freebsd.org>; Mon, 11 Aug 2014 19:59:45 +0000 (UTC)
Received: from [192.168.1.200] (p548181A9.dip0.t-ipconnect.de [84.129.129.169])
 (Authenticated sender: macmic)
 by mail-n.franken.de (Postfix) with ESMTP id 73E681C0C069E;
 Mon, 11 Aug 2014 21:59:42 +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 <Michael.Tuexen@lurchi.franken.de>
In-Reply-To: <CC9987A3-4608-4513-9D46-B81369CB8354@netapp.com>
Date: Mon, 11 Aug 2014 21:59:41 +0200
Content-Transfer-Encoding: quoted-printable
Message-Id: <5D3CBFDC-362E-4DB6-A132-BA842EF5B1B2@lurchi.franken.de>
References: <CAOENNMA_CiBDJc0kchzUbTcf_JBwTJPF=PdBAUB6FPo-KzYkeQ@mail.gmail.com>
 <20140809184232.GF83475@funkthat.com>
 <8AE1AC56-D52F-4F13-AAA3-BB96042B37DD@lurchi.franken.de>
 <20140809204500.GG83475@funkthat.com>
 <3F6BC212-4223-4AAC-8668-A27075DC55C2@lurchi.franken.de>
 <CAOENNMCPuiYS7LHwMfOczhZ4yisjGkpOmWzv2pcAoi9Hhzb7dw@mail.gmail.com>
 <20140810022350.GI83475@funkthat.com>
 <CAOENNMB3=FZx5kSHVPDPBTtMKbmYJ=c_XNMcuYuoLPe=6U+kxg@mail.gmail.com>
 <CAOENNMARg36KH1Y+0wG8pd7sSf8XKnMf6g790_KiKaj3Mdwyjw@mail.gmail.com>
 <20140810033212.GL83475@funkthat.com>
 <CAOENNMA-dwPQr53bM4rzC=1eitoi-JAB4mCGx4zybFwUC=GMNg@mail.gmail.com>
 <17A804F3-BEA6-46F4-887F-B68750618FD9@netapp.com>
 <0CF85443-26AC-4931-9D00-3396C18C7690@lurchi.franken.de>
 <7A4120EE-60F3-4D32-89C4-C694B8DFEAE4@netapp.com>
 <5E8A6382-7096-495A-907C-86CE26A163A2@lurchi.franken.de>
 <CC9987A3-4608-4513-9D46-B81369CB8354@netapp.com>
To: "Eggert, Lars" <lars@netapp.com>
X-Mailer: Apple Mail (2.1878.6)
Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>,
 John-Mark Gurney <jmg@funkthat.com>, Niu Zhixiong <kaiaixi@gmail.com>,
 Bill Yuan <bycn82@gmail.com>
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net/>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 11 Aug 2014 19:59:45 -0000

On 11 Aug 2014, at 21:40, Eggert, Lars <lars@netapp.com> wrote:

> Hi,
>=20
> On 2014-8-11, at 21:27, Michael Tuexen =
<Michael.Tuexen@lurchi.franken.de> wrote:
>> On 11 Aug 2014, at 14:12, Eggert, Lars <lars@netapp.com> wrote:
>>> 544/57/8194 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
>> I guess the above is the problem. The card wants a lot of mbufs...
>> So the problem should go away if you increase the number of =
mbufs/clusters,
>> which means no requests are denied and you don't experience any =
performance
>> issue.
>=20
> And I have six of those ports in that box...
>=20
> So I bump kern.ipc.nmbclusters? Any additional sysctls I should bump?
If I remember correctly, I increased
kern.ipc.nmbufs and kern.ipc.nmbclusters in /boot/loader.conf
After reboot you shouldn't see any denied requests in netstat -m.
Using these setting the card worked fine (for SCTP... ).

Best regards
Michael
>=20
> Thanks,
> Lars
>=20