From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-x22b.google.com (mail-wm0-x22b.google.com [IPv6:2a00:1450:400c:c09::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id E284C3BA8E for ; Sun, 5 Nov 2017 16:41:07 -0500 (EST) Received: by mail-wm0-x22b.google.com with SMTP id r68so10318916wmr.1 for ; Sun, 05 Nov 2017 13:41:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc:message-id:references :to; bh=UXqD4+SFZwl6zDOygk/bjJWUB8aRPzAaj/81Oajxs8E=; b=oTwS3oJjAYSl7OWLTSQ6RacVeNaJgNV76b9CaFy29Mk8eW8wjQXEtzu/OAz/deuZDl d9DYJLfLqJTZe1kFJw2rl4WyFxkVP/PiNQE3OIggE40Gl/ZbS0AwZD7BupidT1pzYeOE sM8jtzoipZ+OAPhaHo01ghEzNSFzE03J7dBX4U7bB/eQme6EM+h/eCtab+SZyhGLHHAS avYRuArGBwfxjtK54a3XlVBMXqAzeTl/pNfYpcSvvStYQj+E4Nb1sLIk/QeoHzHGSJTu 7fh8eX47e4mgdjhvzmGdWBvSL7wPpk2dlEwoCQQryuy2YkLFk5BOxzqFNilmMNgfHV3j C4YA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :message-id:references:to; bh=UXqD4+SFZwl6zDOygk/bjJWUB8aRPzAaj/81Oajxs8E=; b=E2HCfU+AYbsL7Wz+WERnrU5PGgotUcSJaQaFZ5Q89H0ZjjHGeDOQR9yP+jNHomt1ra bK4gIxty5vujP27bvF4p0CGta+2p7gQ0y7JrJXkgPpNzxTDQTPHoswr+Lxp4FEE2X2f2 6LpkkcdFKrXxaXQpXmJ0LZMFm61WKu5Rc0865YPFHH0RxvfWbqiub3LWYqOqBolwQ6Lh AXMrhNvnDCrj0gRB52/zFVE4Xk+P3CdsJ4aYR38zV8+dwISIVzhyk27aMtoazU+pVlyn b5RYuYKVZ/HDeiumw6qGtmVQ5jHrxQk++3yBhIRdCUZxbh7iLWRHJYXn3Ix/9eZ5Z3Y7 ERSA== X-Gm-Message-State: AJaThX6DpvcjA2Oa00vGir6TfTcQUXiP2ODZhjr3gxtWA6M/Zai8nIqE 7NBcRIJfDuRIoH7pZGW+9/k= X-Google-Smtp-Source: ABhQp+RJU03CxtS0pToVWvGKxdmHMwMxBdRBvCw53wiPsFyj0BFRsvp7mCCRVjGT2dsnS1O3gDlkyA== X-Received: by 10.28.160.23 with SMTP id j23mr4245871wme.125.1509918066968; Sun, 05 Nov 2017 13:41:06 -0800 (PST) Received: from [10.72.0.20] (h-1169.lbcfree.net. [185.99.119.68]) by smtp.gmail.com with ESMTPSA id 71sm13112438wmg.0.2017.11.05.13.41.05 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 05 Nov 2017 13:41:06 -0800 (PST) Content-Type: multipart/alternative; boundary="Apple-Mail=_56515322-5A8F-476B-96FE-85D710CD2EBE" Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Pete Heist In-Reply-To: Date: Sun, 5 Nov 2017 22:41:04 +0100 Cc: make-wifi-fast@lists.bufferbloat.net Message-Id: <327DE75E-9C27-4569-AEEC-91207865AB0F@gmail.com> References: <535CD0D7-CB3A-4C42-AB13-548313F9002A@gmail.com> <95AE4A18-0329-42FA-91E2-9EFF356FD8C9@gmail.com> To: Bob McMahon X-Mailer: Apple Mail (2.3124) Subject: Re: [Make-wifi-fast] Flent test hardware X-BeenThere: make-wifi-fast@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 05 Nov 2017 21:41:08 -0000 --Apple-Mail=_56515322-5A8F-476B-96FE-85D710CD2EBE Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On Nov 5, 2017, at 8:42 PM, Bob McMahon = wrote: >=20 > The realtek is definitely not ideal. The test needs to watch the ptp = stats to make sure the corrections are stable over the life of the test = and throw out bad results per test equipment introducing too much error. >=20 > Qualifying a NIC for use in test equipment is a bit of a pain. My = rationale is to avoid consumer grade products, rather leverage the work = of engineers that qualify equipment for data centers, i.e. the data = center market is driving the vendor. I find the INTC server class NICs = to be the best for this so far. I figured as much, and might take it into account that you=E2=80=99re = steering me towards those NICs. I=E2=80=99m pretty sure the I350T2V2 = would work well, so I started another build with it, despite the price: = https://www.senetic.cz/product/I350T2V2?gclid=3DEAIaIQobChMI6u7YkKKo1wIVqw= rTCh0anguMEAAYASAAEgK3O_D_BwE = My latest thought is, if I get a good dual port NIC and go at least a = bit higher-end with the CPU, I shouldn't need a second device, and time = synchronization won=E2=80=99t be an issue, so it could save some effort. = I=E2=80=99ll try a few more options, sleep on it and thanks everyone for = the help!= --Apple-Mail=_56515322-5A8F-476B-96FE-85D710CD2EBE Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
On Nov 5, 2017, at 8:42 PM, Bob McMahon <bob.mcmahon@broadcom.com> wrote:

The realtek is definitely not ideal.  =  The test needs to watch the ptp stats to make sure the corrections = are stable over the life of the test and throw out bad results per test = equipment introducing too much error.

Qualifying a NIC for use in test equipment is a bit of a = pain.  My rationale is to avoid consumer grade products, rather = leverage the work of engineers that qualify equipment for data centers, = i.e. the data center market is driving the vendor.   I find = the INTC server class NICs to be the best for this so far.

I figured as much, and might take it into account that = you=E2=80=99re steering me towards those NICs. I=E2=80=99m pretty sure = the I350T2V2 would work well, so I started another build with it, = despite the price:

https://www.senetic.cz/product/I350T2V2?gclid=3DEAIaIQobChMI6u7= YkKKo1wIVqwrTCh0anguMEAAYASAAEgK3O_D_BwE

My latest thought is, if I get a good = dual port NIC and go at least a bit higher-end with the CPU, I shouldn't = need a second device, and time synchronization won=E2=80=99t be an = issue, so it could save some effort. I=E2=80=99ll try a few more = options, sleep on it and thanks everyone for the = help!
= --Apple-Mail=_56515322-5A8F-476B-96FE-85D710CD2EBE--