From owner-freebsd-transport@freebsd.org Sun Feb 24 12:01:23 2019 Return-Path: Delivered-To: freebsd-transport@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C94C1151C75B for ; Sun, 24 Feb 2019 12:01:23 +0000 (UTC) (envelope-from tuexen@freebsd.org) Received: from drew.franken.de (mail-n.franken.de [193.175.24.27]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "*.franken.de", Issuer "COMODO RSA Domain Validation Secure Server CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 2D7B26A992 for ; Sun, 24 Feb 2019 12:01:22 +0000 (UTC) (envelope-from tuexen@freebsd.org) Received: from [192.168.1.9] (p57BB4A79.dip0.t-ipconnect.de [87.187.74.121]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTPSA id 27253721E2821; Sun, 24 Feb 2019 13:01:13 +0100 (CET) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.2 \(3445.102.3\)) Subject: Re: DSACK From: Michael Tuexen In-Reply-To: Date: Sun, 24 Feb 2019 13:01:11 +0100 Cc: "Scheffenegger, Richard" , "freebsd-transport@freebsd.org" Content-Transfer-Encoding: quoted-printable Message-Id: <58102EB5-6A5A-4BE1-ADEA-4EDCB56A39AE@freebsd.org> References: <5ACAD39A-2A77-43BB-BE93-994C1C6C93AB@freebsd.org> <5AD822A0-06D7-44DB-AFB1-2453FD59A222@freebsd.org> To: Randall Stewart X-Mailer: Apple Mail (2.3445.102.3) X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00 autolearn=disabled version=3.4.1 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on mail-n.franken.de X-Rspamd-Queue-Id: 2D7B26A992 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.97 / 15.00]; local_wl_from(0.00)[freebsd.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.996,0]; NEURAL_HAM_SHORT(-0.97)[-0.975,0]; ASN(0.00)[asn:680, ipnet:193.174.0.0/15, country:DE]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: freebsd-transport@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussions of transport level network protocols in FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 24 Feb 2019 12:01:24 -0000 > On 24. Feb 2019, at 12:32, Randall Stewart wrote: >=20 > I don=E2=80=99t think I have ever seen FreeBSD emit a DSACK. Now = admittedly > I have only paid close attention in current. But that spans even back > into 11 days I think. >=20 > Hmm wonder if I have a 10 machine I can go back and look at :) I tried to test on 10.4 yesterday, but packetdrill doesn't run that well on 10.4 (missing pcap functions)... I'm not sure I want to backport = it. Best regards Michael >=20 > R >=20 >> On Feb 23, 2019, at 5:30 AM, Michael Tuexen = wrote: >>=20 >>> On 23. Feb 2019, at 11:28, Scheffenegger, Richard = wrote: >>>=20 >>>=20 >>> Bin grad am flughafen und hab leider nur HEAD bei mir (und ein iso = von 10, wo ich grad versuch, das mit scapy zu checken). >>>=20 >>> Falls du schnell einen packetdrill gegen BSD11 ohne D18960 machen = kannst, und es da noch DSACKs raussendet, w=C3=A4re das toll! >>>=20 >>> Ich f=C3=BCrchte aber, das das schon l=C3=A4ngere Zeit kaputt ist - = da wir nun doch noch nicht D18960 drinnen haben, wie ich irrt=C3=BCmlich = dachte. >> OK. I'll take a look. >>=20 >> Have a save trip! >>=20 >> Best regards >> Michael >>>=20 >>>=20 >>>=20 >>> -----Original Message----- >>> From: Michael Tuexen =20 >>> Sent: Samstag, 23. Februar 2019 11:25 >>> To: Scheffenegger, Richard >>> Cc: freebsd-transport@freebsd.org >>> Subject: Re: DSACK >>>=20 >>> NetApp Security WARNING: This is an external email. Do not click = links or open attachments unless you recognize the sender and know the = content is safe. >>>=20 >>>=20 >>>=20 >>>=20 >>>> On 23. Feb 2019, at 10:29, Scheffenegger, Richard = wrote: >>>>=20 >>>> Hi, >>>>=20 >>>> A colleague pointed me to the stack (HEAD) no longer emitting DSACK = options a few days ago... >>>>=20 >>>> I was under the impression, that older versions of FreeBSD would = send out DSACKs for spurious duplicate packets. >>>>=20 >>>> But when I try this script against HEAD, regular cumulative ACKs = without DSACK blocks are showing up. >>>>=20 >>>> Currently bandwidth starved - but was that a conscious decision? Or = was me observing DSACKs never a thing? >>> I would say if it is working in stable/11, but not in stable/12 and = head, it is a regression. >>>=20 >>> Best regards >>> Michael >>>>=20 >>>> Thanks a lot, >>>> Richard >>>>=20 >>>=20 >>=20 >> _______________________________________________ >> freebsd-transport@freebsd.org mailing list >> https://lists.freebsd.org/mailman/listinfo/freebsd-transport >> To unsubscribe, send any mail to = "freebsd-transport-unsubscribe@freebsd.org" >=20 > ------ > Randall Stewart > rrs@netflix.com >=20 >=20 >=20