Date: Wed, 06 Jun 2012 13:13:02 -0600 From: Philip Prindeville <philipp_subx@redfish-solutions.com> To: freebsd-net@freebsd.org Subject: Re: IP_RECVTOS Message-ID: <4FCFABBE.7030008@redfish-solutions.com> In-Reply-To: <8D7E9322-0973-4657-B3FE-8A480C0E0304@lurchi.franken.de> References: <1D03F00E-2777-4B0B-8E1C-860EA115B6AF@lurchi.franken.de> <CAJ-Vmona0kHnOKXdmQDYksqGifmd5Fjgg-YniTcrHFZvZBv--Q@mail.gmail.com> <7731AEE8-D1BF-4297-8F75-454149D3E303@lurchi.franken.de> <CAJ-VmomrqRLkyTCFsgfcAsXC1V4KubsZ3AeY2K%2B6X7u-yjBOoQ@mail.gmail.com> <5A4A73CF-95FB-4B33-9652-2E4FD517CF5F@lurchi.franken.de> <CAJ-Vmo=1o72QB%2B0tBcvO8A37xdzMCsS3JAFa5%2B6DM6%2BwqfQWPA@mail.gmail.com> <5399FCC6-BDC4-47DD-9948-ADD16264EE46@lurchi.franken.de> <CAJ-Vmo=BDfQ5_yd=bzBwYr=P7xLeS=mRckncCuGBJPYxz4XRoA@mail.gmail.com> <8D7E9322-0973-4657-B3FE-8A480C0E0304@lurchi.franken.de>
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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? 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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