[Tech] Re: Backoff considered harmful?

[toad]

On Mon, Nov 27, 2006 at 10:02:09PM +0100, Jano wrote:
> 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?

So the oldest stuff never completes, instead of the newest stuff never
completing?
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