On 10/03/2016 06:12, Elwyn Davies wrote:
> I am the assigned Gen-ART reviewer for this draft.
And I am another Gen-ART reviewer who saw this go by:
...
> Minor issues: Treatment of packets that don't fit into the hashing
> classification scheme: The default FQ-CoDel hashing
> mechanism uses the protocol/addresses/ports 5-tuple, but there will be
> packets that don't fit this scheme (especially ICMP).
> There is no mention of what the classification would do with these packets.
> I guess that one extra queue would probably
> suffice to hold any such outliers, but it would be wise to say something
> about how the packets from this/these queue(s) would
> be treated by the scheduler. It might also be useful to say something about
> treatment of outliers in other classification
> schemes, if only to say that the scheme used needs to think about any such
> outliers.
For IPv6 there is another issue here: the well-known difficulty in finding
the protocol and port numbers at line speed when extension headers are present.
Which is of course why IPv6 senders are supposed to set the flow label, which
should in turn provide a handy 3-tuple (addresses/flow label) that would be
ideal for CoDel. The operational facts today are that most hosts don't set
the flow label and many paths through the Internet drop packets with extension
headers, but the fact that the 5-tuple is problematic in this way might be
worth mentioning.
Brian
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