consumer flow control??

[Fraser Adams]

Hello,
I seem to recall that it's possible to set consumer flow control with 
Qpid is that correct?

I can't see anything specific in the documentation relating to consumer 
flow control, I thought that it had something to do with message credits 
or consumer prefetching but I'm not sure how this actually relates to 
throttling consumers to a particular rate.

TBH I also thought that there was a "capacity" option in the 
AddressString for link, in 
http://qpid.apache.org/books/0.20/Programming-In-Apache-Qpid/html/ch03s06.html 
there's mention of the |-Dmax_prefetch=1000 and |
|{create: always, link:{capacity: 10}} |but it no longer mentions 
capacity in the Link Properties section in table 2.3 so I'm not sure.

I had a quick play setting capacity and max_prefetch to some low value 
such as 10 or 1 but to be honest I couldn't see much difference to the 
rate that the consumer was pulling messages.

Have I missed something, can anyone offer any tips as to how to throttle 
consumers??

Cheers,
Frase