[Nottingham] NTL speed increases

Martin martin at ml1.co.uk
Tue Mar 22 18:40:23 GMT 2005

Michael Leuty wrote:
> On a related point, I've noticed that although download speeds are OK,
> while using Bittorrent the upload speeds are very ropey indeed. The
> graph in Azureus shows short periods of a "plateau" with constant 25
> KB/s upload speed, and then long periods that look like a mountain
> range with speeds fluctuating from 0 up to 20 KB/s.
> To my untutored eye this looks like a Fault. Is it something I should
> report to NTL?...

I wouldn't bother unless _you_ have a specific identifiable fault.

More likely is that the destination that you are uploading to is 
suffering ACK packet delays due to their link being saturated.

You yourself could be suffering similar delays on your link (in the 
reverse direction) because you haven't throttled the data and you're 
seeing a second or so of data buffering on your modem.

Look up wondershaper, or come to my talk on traffic shaping later this 
year. Also look up chaos theory and critical systems (;-))

(Oooops! Better post the nlug calendar!!)


Martin Lomas
martin at ml1.co.uk

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