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From: Michael Tuexen <Michael.Tuexen@lurchi.franken.de>
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Date: Thu, 7 Jun 2012 09:27:14 +0200
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To: Philip Prindeville <philipp_subx@redfish-solutions.com>
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Subject: Re: IP_RECVTOS
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On Jun 6, 2012, at 9:13 PM, Philip Prindeville wrote:

> On 6/6/12 11:54 AM, Michael Tuexen wrote:
>> On Jun 6, 2012, at 7:17 PM, Adrian Chadd wrote:
>>=20
>>> Hi,
>>>=20
>>> For TCP, I've seen the network layer change things (eg setting bits =
on
>>> incoming traffic to mark which interface it came in on), so you =
can't
>>> guarantee the outbound ToS =3D=3D inbound ToS.
>> I've not said that inbound =3D=3D outbound... I just wanted to make =
clear
>> that there is a socket option of setting the TOS byte for outgoing
>> traffic. The TCP stack might overwrite the ECN bits...
>>=20
>> I need the IP_RECVTOS functionality for implementing a transport =
stack supporting
>> ECN in userland, actually running the SCTP kernel sources (with some =
glue code)
>> in userland on top of UDP...
>>=20
>> Best regards
>> Michael
>=20
> What about UDT? Can you patch that as well?
The UDT implementation can use IP_RECVTOS option, however I don't have =
the
time to look into this for the UDT implementation.

Best regards
Michael
>=20
> For certain services (like backups or AFP), it might be useful for a =
server to be able to detect a QoS-friendly client and reciprocate in =
kind.
>=20
> -Philip
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>=20