RE: [RPRWG] Question on ClassB client traffic
Prasad,
There is no buffer-full type of back pressure because the add queues (or
buffers) are maintained by the client, not the MAC. Depending upon the
implementation, the client may push a packet out of an add queue when the
associated Send signal is active, or the MAC may pull a packet out of an add
queue when the associated Send signal is active. In the former case, the
client would need to use the Send signals to figure out when to send and
what to send. In the latter case, the client could ignore the signals and
just keep stuffing its queues. It's an implementation decision.
jl
-----Original Message-----
From: Prasad Modali [mailto:prasad_modali@xxxxxxxxxxxxxxx]
Sent: Thursday, June 27, 2002 6:11 PM
To: Stds-802-17
Cc: Anil Nangunoori
Subject: [RPRWG] Question on ClassB client traffic
Hi All,
Annex I in D0.3 describes the MAC client behavior. The
packet forwarding logic in the MAC has to give priority to
the ClassA transit traffic. So a client inserting ClassB
packets into the MAC could be back pressured by a burst
of ClassA transit traffic.
How does the client distinguish between buffer-full type
of back pressure vs. ClassB rate shaping(tokens expiry)
related back pressure? When classB tokens expire, client
can still send classB packets if SendC is asserted.
thanks
--
Prasad Modali
Chip Engines Inc
(408)991-9800 x116