From owner-freebsd-net@freebsd.org Wed Oct 21 12:26:17 2015 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id CC65BA1AE31 for ; Wed, 21 Oct 2015 12:26:17 +0000 (UTC) (envelope-from lars@netapp.com) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id A515A1061 for ; Wed, 21 Oct 2015 12:26:17 +0000 (UTC) (envelope-from lars@netapp.com) Received: by mailman.ysv.freebsd.org (Postfix) id A47BBA1AE30; Wed, 21 Oct 2015 12:26:17 +0000 (UTC) Delivered-To: net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id A41D4A1AE2F for ; Wed, 21 Oct 2015 12:26:17 +0000 (UTC) (envelope-from lars@netapp.com) Received: from mx143.netapp.com (mx143.netapp.com [216.240.21.24]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "mx143.netapp.com", Issuer "Symantec Class 3 Secure Server CA - G4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 55737105E; Wed, 21 Oct 2015 12:26:16 +0000 (UTC) (envelope-from lars@netapp.com) X-IronPort-AV: E=Sophos;i="5.17,711,1437462000"; d="asc'?scan'208";a="73587828" Received: from hioexcmbx06-prd.hq.netapp.com ([10.122.105.39]) by mx143-out.netapp.com with ESMTP; 21 Oct 2015 05:26:00 -0700 Received: from HIOEXCMBX07-PRD.hq.netapp.com (10.122.105.40) by hioexcmbx06-prd.hq.netapp.com (10.122.105.39) with Microsoft SMTP Server (TLS) id 15.0.1104.5; Wed, 21 Oct 2015 05:26:00 -0700 Received: from HIOEXCMBX07-PRD.hq.netapp.com ([::1]) by hioexcmbx07-prd.hq.netapp.com ([fe80::e1d9:911e:3048:d510%21]) with mapi id 15.00.1104.000; Wed, 21 Oct 2015 05:26:00 -0700 From: "Eggert, Lars" To: Bruce Evans CC: Ian Smith , Kevin Oberman , "net@freebsd.org" , "jfv@FreeBSD.org" , "ricera10@gmail.com" , Luigi Rizzo , Giuseppe Lettieri Subject: Re: ixl 40G bad performance? Thread-Topic: ixl 40G bad performance? Thread-Index: AQHRCnVeClivuZWSFkK4WCM/ynkiH55zUwOAgAAMKACAAAITgIAA5BEAgAA8ooCAACxPAIAAP6UAgAFpzQA= Date: Wed, 21 Oct 2015 12:25:59 +0000 Message-ID: <12938D48-44B9-456A-AD7C-630D7E09BB35@netapp.com> References: <79830D9D-94E6-47A9-92B9-D63DF5432272@netapp.com> <20151020190541.B15983@sola.nimnet.asn.au> <6CD6754D-FC0E-4B24-AAEC-7C9D68284141@netapp.com> <20151020232218.G1833@besplex.bde.org> In-Reply-To: <20151020232218.G1833@besplex.bde.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3094) x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.122.56.79] Content-Type: multipart/signed; boundary="Apple-Mail=_0220844F-3D93-4781-B1B5-E7999C199CB0"; protocol="application/pgp-signature"; micalg=pgp-sha256 MIME-Version: 1.0 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Oct 2015 12:26:18 -0000 --Apple-Mail=_0220844F-3D93-4781-B1B5-E7999C199CB0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi Bruce, thanks for the very detailed analysis of the ixl sysctls! On 2015-10-20, at 16:51, Bruce Evans wrote: >=20 > Lowering (improving) latency always lowers (unimproves) throughput by > increasing load. That, I also understand. But even when I back off the itr values to = something more reasonable, throughput still remains low. With all the tweaking I have tried, I have yet to top 3 Gb/s with ixl = cards, whereas they do ~13 Gb/s on Linux straight out of the box. Lars --Apple-Mail=_0220844F-3D93-4781-B1B5-E7999C199CB0 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- iQCVAwUBVieEVdZcnpRveo1xAQh9egQAqxX1TeZj7SMuFuecd2js5ODhooofXz7w V8yXFQgjeK6MzthBqlr4jK+LA1osZOWcLIzfXxlIXPYb1MhG5Ei8QMGCH2ZW7B9b Wzu6yavZovncQc/tC89ZfETqTTalqXueCH3vsXlcItvbefuszekBjhBsc+b4LM6I X0jIObpPXho= =EdNi -----END PGP SIGNATURE----- --Apple-Mail=_0220844F-3D93-4781-B1B5-E7999C199CB0--