Date: Sat, 23 Feb 2019 10:28:24 +0000 From: "Scheffenegger, Richard" <Richard.Scheffenegger@netapp.com> To: Michael Tuexen <tuexen@freebsd.org> Cc: "freebsd-transport@freebsd.org" <freebsd-transport@freebsd.org> Subject: RE: DSACK Message-ID: <SN4PR0601MB3728DDE5402768567DA9415F86780@SN4PR0601MB3728.namprd06.prod.outlook.com> In-Reply-To: <5ACAD39A-2A77-43BB-BE93-994C1C6C93AB@freebsd.org> References: <SN4PR0601MB3728752D55B7231BC4CF22B586780@SN4PR0601MB3728.namprd06.prod.outlook.com> <5ACAD39A-2A77-43BB-BE93-994C1C6C93AB@freebsd.org>
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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). Falls du schnell einen packetdrill gegen BSD11 ohne D18960 machen kannst, u= nd es da noch DSACKs raussendet, w=E4re das toll! Ich f=FCrchte aber, das das schon l=E4ngere Zeit kaputt ist - da wir nun do= ch noch nicht D18960 drinnen haben, wie ich irrt=FCmlich dachte. -----Original Message----- From: Michael Tuexen <tuexen@freebsd.org>=20 Sent: Samstag, 23. Februar 2019 11:25 To: Scheffenegger, Richard <Richard.Scheffenegger@netapp.com> Cc: freebsd-transport@freebsd.org Subject: Re: DSACK NetApp Security WARNING: This is an external email. Do not click links or o= pen attachments unless you recognize the sender and know the content is saf= e. > On 23. Feb 2019, at 10:29, Scheffenegger, Richard <Richard.Scheffenegger@= netapp.com> wrote: > > Hi, > > A colleague pointed me to the stack (HEAD) no longer emitting DSACK optio= ns a few days ago... > > I was under the impression, that older versions of FreeBSD would send out= DSACKs for spurious duplicate packets. > > But when I try this script against HEAD, regular cumulative ACKs without = DSACK blocks are showing up. > > Currently bandwidth starved - but was that a conscious decision? Or was m= e observing DSACKs never a thing? I would say if it is working in stable/11, but not in stable/12 and head, i= t is a regression. Best regards Michael > > Thanks a lot, > Richard >
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