[e2e] What's wrong with this picture?
detlef.bosau at web.de
Sun Sep 13 04:57:27 PDT 2009
Ken Calvert wrote:
> What I think is interesting about this discussion is that the original
> "framers" [:-)] of TCP saw nothing wrong with an MSL denominated in
> minutes, and now delivering a datagram after it spends 10 seconds in
> the network is considered harmful. In between came VJCC -- but we've
> had that all these years and this is the first time I've heard anyone
> suggest it's a problem that packets can survive in the network for
> one-sixth of a minute.
> An MSL is required so TCP (or any *practical* reliable transport) can
> have certain safety properties. This discussion shows that MSL has
> implications for the CC control loop as well. TCP's correctness would
> be fine if the MSL were 10 seconds, so *if* the consensus is that
> multiple seconds of buffering is broken, why not acknowledge that the
> world has changed and make that an "official" IETF policy?
Did I get you right: MSL = Maximum Segment Length?
Now, then the question is: what's the reason for a MSL of 10 seconds?
Is this the maximum segment _size_ of perhaps 50 Gigabytes, which
requires this temporal extension?
Or is it a heroic effort link which is busy with the error free delivery
of one or two bytes?
In the latter case, I wouldn't call that MSL but head of line blocking...
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