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Date:      Sun, 24 Feb 2019 13:01:11 +0100
From:      Michael Tuexen <tuexen@freebsd.org>
To:        Randall Stewart <rrs@netflix.com>
Cc:        "Scheffenegger, Richard" <Richard.Scheffenegger@netapp.com>, "freebsd-transport@freebsd.org" <freebsd-transport@freebsd.org>
Subject:   Re: DSACK
Message-ID:  <58102EB5-6A5A-4BE1-ADEA-4EDCB56A39AE@freebsd.org>
In-Reply-To: <F75B74B6-752F-4F6A-886A-E00A484E051E@netflix.com>
References:  <SN4PR0601MB3728752D55B7231BC4CF22B586780@SN4PR0601MB3728.namprd06.prod.outlook.com> <5ACAD39A-2A77-43BB-BE93-994C1C6C93AB@freebsd.org> <SN4PR0601MB3728DDE5402768567DA9415F86780@SN4PR0601MB3728.namprd06.prod.outlook.com> <5AD822A0-06D7-44DB-AFB1-2453FD59A222@freebsd.org> <F75B74B6-752F-4F6A-886A-E00A484E051E@netflix.com>

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> On 24. Feb 2019, at 12:32, Randall Stewart <rrs@netflix.com> wrote:
>=20
> 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.
>=20
> Hmm wonder if I have a 10 machine I can go back and look at :)
I tried to test on 10.4 yesterday, but packetdrill doesn't run that
well on 10.4 (missing pcap functions)... I'm not sure I want to backport =
it.

Best regards
Michael
>=20
> R
>=20
>> On Feb 23, 2019, at 5:30 AM, Michael Tuexen <tuexen@freebsd.org> =
wrote:
>>=20
>>> On 23. Feb 2019, at 11:28, Scheffenegger, Richard =
<Richard.Scheffenegger@netapp.com> 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 <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
>>>=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 =
<Richard.Scheffenegger@netapp.com> 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"
>=20
> ------
> Randall Stewart
> rrs@netflix.com
>=20
>=20
>=20




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