[Tech] Re: Backoff considered harmful?

[Jano]

Michael Rogers wrote:

> toad wrote:
>> In which case, can you detect at what point the throttle becomes the
>> limiting factor rather than the submission of requests?
> 
> The network with no flow control gets better throughput than the
> networks with flow control even at very low request rates - this
> probably just reflects the fact that it's hard to get 100% utilisation
> from an adaptive throttling mechanism. Anyway the difference is small at
> low request rates.
> 
> The difference gets larger as the request rate increases - then
> somewhere between 10 and 12 requests per node per minute, the throughput
> of the network without flow control drops practically to zero as the
> message queues get long enough to cause most requests to time out. 

Are these queues FIFO? Would made any sense to try a LIFO policy governed by
available bandwidth?