Re: TCP limitations (was Re: ISCSI: Urgent Flag requirement violates TCP.)

[Vern Paxson <vern@ee.lbl.gov>]

> Just because the old software TCP implementation could not sustain a very
> high data rate over a WAN using TCP, it is not OK to conclude the design
> point of GB/s with TCP not making sense in practice. In a couple of years,
> the WAN and MAN and LAN will start to use 10 Gb/s connection.  The Internet
> community must raise up to this challenge even if we must change the old TCP
> implementations. I do believe it is possible for a TOE adapter to run in
> slow mode with old TCP implementation and fast mode with another TOE
> adapter.  We just have to make sure the iSCSI spec. does not prevent that.

Keep in mind that this change (altering the throughput equation) requires
modification of TCP's basic congestion control algorithm.  It is *not*
simply fixing up "old software implementations".

Such a change will likely take quite a while to hammer out.

		Vern