[ENet-discuss] Peer starving problem....

Adam D. Moss adam at gimp.org
Tue May 30 02:33:03 PDT 2006


As a test completely aside from ENet, do you find that
large file downloads (i.e. FTP) over this link slow to a
trickle (or even timeout) while you are performing large
file uploads?  This is a really common, and unpleasant,
scenario for 'home' lines with high download:upload
bandwidth ratios.

If this proves to be the case then google for 'ack
starvation' and 'ack prioritization'.  There seem to be
no trivial cures for this, though I'd be interested in
hearing.  Most workarounds seem to boil down to limiting
outgoing bandwidth to something rather smaller than the
'true' line speed, whether by packet-shaping or (hackier
still) at the application level, where this new limit is
discovered by trial-and-error.  Ugh.

--adam


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