iSCSI: Flow Control

[David Robinson <David.Robinson@EBay.Sun.COM>]

> - The "flow control" issue is definitely still
> open.  The sliding window mechanism is one way of
> addressing this, but I'd venture that it may not
> be the one that would get chosen if this were the
> only goal.  So the "flow control" issue is definitely
> open, and if that results in putting back the
> reference numbers and sliding windows, so be it ...
> but not without a serious consideration of other
> design alternatives such as capacity advertisement
> on login and credit-based mechanisms.  Keep in
> mind that this is iSCSI-level flow control; the
> WG does not have a license to tinker with TCP's
> flow and congestion control.

Could someone please clearly state the problem that
iSCSI "flow control" is attempting to solve.  Given
the reliable stream nature of TCP with its flow
control, what problem exists? Also with an iSCSI
layer flow control will we not also be victim to some
nasty hysteresis effects due to TCP's flow control as
well?

	-david