DSACK

[Scheffenegger, Richard]

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, und es da noch DSACKs raussendet, wäre das toll!

Ich fürchte aber, das das schon längere Zeit kaputt ist - da wir nun doch noch nicht D18960 drinnen haben, wie ich irrtümlich dachte.



-----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
>