From owner-freebsd-net@FreeBSD.ORG Sun Sep 23 15:35:18 2012 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id F1AE1106566B for ; Sun, 23 Sep 2012 15:35:17 +0000 (UTC) (envelope-from andrey@zonov.org) Received: from mail-lb0-f182.google.com (mail-lb0-f182.google.com [209.85.217.182]) by mx1.freebsd.org (Postfix) with ESMTP id 620638FC15 for ; Sun, 23 Sep 2012 15:35:16 +0000 (UTC) Received: by lbbgg13 with SMTP id gg13so7013027lbb.13 for ; Sun, 23 Sep 2012 08:35:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=sender:message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:x-enigmail-version:content-type :x-gm-message-state; bh=rylUOdV8Z67bH3pKioSaZu+Un9FR4duF1k52CYLlNcA=; b=Wgv4hkZg/m6J3AbhP3gXVydVjVwtqz8A/eEuWOpEjabHD9fYg0nC4W2j9kXjWww3QG 6fNRl/rm0tKmLy9GGHAevyjjubsLTnufSHAoabqj4PTiG+QutEx2986pfzB1fc6rdaBd j4IGFf5vQX5LmJm6d9tnErF7de6W4N7I+iA4a8O3q0IUHvJuLtzfVedrDDeHA7C1mfDT 1mHlfQIzWmt8RTgSyl3SEKpsWpJ/MBJLFPLP7lN7pXcf7A5+V/HeiR5NgfW0hhB/uef2 Nqc2FN3lpNgfD1pX4Il+JL4F+oL99nI4jeyfS1DD4t1DhMkE1Y5fLRrFkS2DfMiMID+e 3Lxw== Received: by 10.152.110.9 with SMTP id hw9mr8517830lab.55.1348414515708; Sun, 23 Sep 2012 08:35:15 -0700 (PDT) Received: from zont-osx.local (ppp95-165-139-113.pppoe.spdop.ru. [95.165.139.113]) by mx.google.com with ESMTPS id d1sm3642952lbh.7.2012.09.23.08.35.13 (version=SSLv3 cipher=OTHER); Sun, 23 Sep 2012 08:35:14 -0700 (PDT) Sender: Andrey Zonov Message-ID: <505F2C2D.5050904@FreeBSD.org> Date: Sun, 23 Sep 2012 19:35:09 +0400 From: Andrey Zonov User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:15.0) Gecko/20120907 Thunderbird/15.0.1 MIME-Version: 1.0 To: "Eggert, Lars" References: <505AC500.6060903@FreeBSD.org> In-Reply-To: X-Enigmail-Version: 1.4.4 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig820D10D9530C18AC3549AFD4" X-Gm-Message-State: ALoCoQlL6buVtEoSytnnxFo5nMuU7UhbOXgmnTTrCWM7vJgkdzHR2Rhh71kXO+Ys9XPvcxAPH+z1 Cc: "freebsd-net@freebsd.org" Subject: Re: [patch] sysctls for TCP timers X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 23 Sep 2012 15:35:18 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig820D10D9530C18AC3549AFD4 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 9/20/12 11:35 AM, Eggert, Lars wrote: > Hi, >=20 > On Sep 20, 2012, at 9:25, Andrey Zonov wrote: >> Some of them may be read google's article about tuning TCP parameters >> [1]. I convert most of TCP timers to sysctls [2] and we are using thi= s >> patch for few months. We tuned net.inet.tcp.rtobase and >> net.inet.tcp.syncache.rexmttime and it gives good results (especially = in >> conjunction with cc_htcp(4)). >=20 > can you share some measurements that quantify the results? >=20 When we set net.inet.tcp.syncache.rexmttime=3D200 and net.inet.tcp.syncache.rexmtlimit=3D7 for our external web service, the number of duplicated SYN was reduced in four times. --=20 Andrey Zonov --------------enig820D10D9530C18AC3549AFD4 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.18 (Darwin) Comment: GPGTools - http://gpgtools.org iQEcBAEBAgAGBQJQXywwAAoJEBWLemxX/CvTuoQH/1b0a2TTuiQ+t/c65FBBcRG1 oQvAEf9T+aT1yxB603+itGu9iS+Rf775E4TwpkNEBOOfPY2qjzsH/L2UB+by2HL8 JwvVizXMfZgqmHR7U0HoXWN8isiYng1aA7SVSCVZdZz7ZeLXehNdGA0BGHj8ZO3M XUiI6Pq9wnH1wSIYBSPHsFCOqBX06390/yxJUS55Twq4pICamaVu8xDcrOLSl9hu kQw4bErBHyDm0x96H/GLPy5Fh5YMUlFSuLi/eZRCb8ytqeWFLEyLvRFT4lGWhhi8 k5qq9tTTGaobHQOtOpd+pVYLu3ZlR1Y/zQW9/KAvbpsHFlIQaiIztw36X2srV+M= =4g0B -----END PGP SIGNATURE----- --------------enig820D10D9530C18AC3549AFD4--