From owner-freebsd-transport@freebsd.org Sat Feb 23 10:30:58 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 9ABE515102FC for ; Sat, 23 Feb 2019 10:30:58 +0000 (UTC) (envelope-from tuexen@freebsd.org) Received: from drew.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) (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 5EE9084E90 for ; Sat, 23 Feb 2019 10:30:56 +0000 (UTC) (envelope-from tuexen@freebsd.org) Received: from [192.168.1.9] (p57BB40DA.dip0.t-ipconnect.de [87.187.64.218]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTPSA id 893F3721E281E; Sat, 23 Feb 2019 11:30:51 +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: Sat, 23 Feb 2019 11:30:50 +0100 Cc: "freebsd-transport@freebsd.org" Content-Transfer-Encoding: quoted-printable Message-Id: <5AD822A0-06D7-44DB-AFB1-2453FD59A222@freebsd.org> References: <5ACAD39A-2A77-43BB-BE93-994C1C6C93AB@freebsd.org> To: "Scheffenegger, Richard" 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-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: Sat, 23 Feb 2019 10:30:58 -0000 > 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. Have a save trip! 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