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[68.62.252.27]) by mx.google.com with ESMTPSA id c4sm16879153qad.0.2013.07.28.13.18.20 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sun, 28 Jul 2013 13:18:21 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\)) Subject: Re: Recommendations for 10gbps NIC From: Scott Long In-Reply-To: Date: Sun, 28 Jul 2013 16:18:20 -0400 Content-Transfer-Encoding: quoted-printable Message-Id: <55F6FD95-0634-4371-9384-14B8E8D74C6E@yahoo.com> References: <51F0386D.2000709@acm.poly.edu> <51F16A07.9030505@FreeBSD.org> <1374852658.90079.YahooMailNeo@web121601.mail.ne1.yahoo.com> <51F2A313.9070105@FreeBSD.org> <1374876857.42890.YahooMailNeo@web121603.mail.ne1.yahoo.com> <51F37E97.3090203@FreeBSD.org> <51F387E8.6090704@FreeBSD.org> <51F3F3BA.20604@freebsd.org> To: Jack Vogel X-Mailer: Apple Mail (2.1508) X-Gm-Message-State: ALoCoQmXSrUaYT0OxQcdaUnU0sQVdvnmw6hma86YmzMRBdkMJ5HoH442rxvaHAXC2fklhEVipcyd Cc: "freebsd-net@freebsd.org" , "Alexander V. Chernikov" , Andre Oppermann , Luigi Rizzo X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.14 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, 28 Jul 2013 20:18:23 -0000 On Jul 28, 2013, at 2:42 PM, Jack Vogel wrote: > On Sat, Jul 27, 2013 at 9:22 AM, Andre Oppermann = wrote: >=20 >> On 27.07.2013 10:42, Alexander V. Chernikov wrote: >>=20 >>> On 27.07.2013 12:15, Luigi Rizzo wrote: >>>=20 >>>> On Sat, Jul 27, 2013 at 10:02 AM, Alexander V. Chernikov >>>> wrote: >>>> This makes me curious because i believe people have used netmap = with >>>> the 82598 and achieved close to line rate even with 64-byte = frames/one >>>> port, >>>> and i thought (maybe I am wrong ?) the various 2-port NICs use 4 = lanes >>>> per port. >>>> So the number i remember does not match with your quote of 2.5Gt/s. >>>> Are all 82598 using 2.5GT/s (which is a gen.1 speed) instead of 5 ? >>>>=20 >>>>=20 >>=20 >>> Quoting 82598EB datasheet: >>> The PCIe v2.0 (2.5 GT/s) interface is used by the 82598EB as a host >>> interface. It supports x8, x4, >>> x2 and x1 configurations at a speed of 2.5 GHz. The maximum = aggregated >>> raw ban.. >>>=20 >>> Actually I discovered this exactly with netmap and 82598*-DA2 NIC :) >>>=20 >>=20 >> Discussing the 82598 is moot because it has been replaced with the = 82599 >> which supports x1-x8 at 5 GT/s. AFAIK you can't event buy the 82598 >> anymore. >>=20 >>=20 > Yes, and the new quad port adapters on PCIE Gen 3 give you 8GT/s = bandwidth > for > the device. I'm not sure if you could buy the 82598 but I surely would = not > recommend > it to anyone :) FWIW, sometimes these kinds of cards are interesting if your primary = interest is link failover instead of aggregate link speed. If the 82598 generated = less heat and/or consumed less power, or was significantly cheaper than more = modern offerings, it can still be attractive. Scott