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([2607:fb10:7061:7fd::8fc7]) by smtp.gmail.com with ESMTPSA id 132sm3503356qke.0.2019.02.24.03.32.22 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 24 Feb 2019 03:32:22 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) Subject: Re: DSACK From: Randall Stewart In-Reply-To: <5AD822A0-06D7-44DB-AFB1-2453FD59A222@freebsd.org> Date: Sun, 24 Feb 2019 06:32:21 -0500 Cc: "Scheffenegger, Richard" , "freebsd-transport@freebsd.org" Content-Transfer-Encoding: quoted-printable Message-Id: References: <5ACAD39A-2A77-43BB-BE93-994C1C6C93AB@freebsd.org> <5AD822A0-06D7-44DB-AFB1-2453FD59A222@freebsd.org> To: Michael Tuexen X-Mailer: Apple Mail (2.3445.9.1) X-Rspamd-Queue-Id: F3D336A00B X-Spamd-Bar: --------------- X-Spamd-Result: default: False [-15.87 / 15.00]; TO_DN_EQ_ADDR_SOME(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; MV_CASE(0.50)[]; RCVD_COUNT_THREE(0.00)[3]; MX_GOOD(-0.01)[alt1.aspmx.l.google.com,aspmx.l.google.com,aspmx2.googlemail.com,alt2.aspmx.l.google.com,aspmx3.googlemail.com]; DKIM_TRACE(0.00)[netflix.com:+]; DMARC_POLICY_ALLOW(-0.50)[netflix.com,reject]; SUBJ_ALL_CAPS(0.38)[5]; NEURAL_HAM_SHORT(-0.98)[-0.977,0]; FROM_EQ_ENVFROM(0.00)[]; IP_SCORE(-2.76)[ip: (-9.10), ipnet: 2607:f8b0::/32(-2.64), asn: 15169(-2.00), country: US(-0.07)]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; RCVD_TLS_LAST(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[netflix.com:s=google]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-transport@freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; WHITELIST_DMARC(-7.00)[netflix.com:D:+]; RCVD_IN_DNSWL_NONE(0.00)[2.3.8.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; WHITELIST_SPF_DKIM(-3.00)[netflix.com:d:+,netflix.com:s:+] 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 11:32:25 -0000 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. Hmm wonder if I have a 10 machine I can go back and look at :) R > 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" ------ Randall Stewart rrs@netflix.com