IP_RECVTOS

[Michael Tuexen]

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:
>> 
>>> Hi,
>>> 
>>> 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 == inbound ToS.
>> I've not said that inbound == 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...
>> 
>> 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...
>> 
>> Best regards
>> Michael
> 
> 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
> 
> 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.
> 
> -Philip
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