DSACK

[Randall Stewart]

I don’t 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 <tuexen at freebsd.org> wrote:
> 
>> On 23. Feb 2019, at 11:28, Scheffenegger, Richard <Richard.Scheffenegger at netapp.com> wrote:
>> 
>> 
>> 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.
> OK. I'll take a look.
> 
> Have a save trip!
> 
> Best regards
> Michael
>> 
>> 
>> 
>> -----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
>> 
>> 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.
>> 
>> 
>> 
>> 
>>> 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
>>> 
>> 
> 
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------
Randall Stewart
rrs at netflix.com