Re: Concensus Call on Urgent Pointer.

[Daniel Smith <dfsmith@almaden.ibm.com>]

I'd word it closer to:

"During login, if the target reqests use of the Urgent Pointer (UP) then
this should be taken as meaning that the target will operate more
efficiently when the UP is used.  The initiator should make an effort to use
the UP.  If it is unable (or unwilling, because of user intervention*) to
use the UP then it must indicate its non-compliance to the target."

And so on.

The actual Text messages I'd suggest are; (I=initiator, T=target)

Text send messages

-> UrgentPointerFromInitiator: 1    (to indicate I can send UP)
-> UrgentPointerFromTarget: 1       (to indicate I would like T to use UP)

Text response messages

<- UrgentPointerFromInitiator: 1    (to indicate T wants UP)
     or
<- UrgentPointerFromInitiator: 0    (to indicate T does not want UP)
     or
<- (no response)                    (to indicate T did not understand UP rq)

<- UrgentPointerFromTarget: 1       (to indicate T will send UP)
     or
<- UrgentPointerFromTarget: 0       (to indicate T will not send UP)
     or
<- (no response)                    (to indicate T did not understand UP rq)

The default should be TCP normal data (i.e., no UP).

Daniel Smith




* Maybe a stack on the system is known to fail with UP, or a firewall/QoS
router treats bulk urgent data badly.
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Matt Wakeley wrote:
> 
> I think the spec should say:
> 
> "During login, if the target requests use of the Urgent Pointer, then the
> initator Must use the Urgent Pointer when
> sending data.  If the target does not request use of the Urgent Pointer, then
> the initiator Must Not use the Urgent Pointer when sending data."
> 
> and likewise...
> 
> "During login, if the initiator requests use of the Urgent Pointer, then the
> target Must use the Urgent Pointer when
> sending data.  If the initiator does not request use of the Urgent Pointer,
> then the target Must Not use the Urgent Pointer when sending data."
> 
> -Matt
> 
>