DSACK

[Scheffenegger, Richard]

Opened https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235959 to track this.

(Scapy seems to be running on my local bsd10 vm now, will check it while on the plane)

-----Original Message-----
From: Michael Tuexen <tuexen at freebsd.org> 
Sent: Samstag, 23. Februar 2019 11:25
To: Scheffenegger, Richard <Richard.Scheffenegger at netapp.com>
Cc: freebsd-transport at freebsd.org
Subject: Re: DSACK

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> On 23. Feb 2019, at 10:29, Scheffenegger, Richard <Richard.Scheffenegger at netapp.com> wrote:
>
> Hi,
>
> A colleague pointed me to the stack (HEAD) no longer emitting DSACK options 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 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.

Best regards
Michael
>
> Thanks a lot,
>   Richard
>