[OpenAFS] Network becomes terribly slow when cache manager flushes updates over xDSL

Harald Barth haba@kth.se
Tue, 07 Jul 2009 16:52:58 +0200 (CEST)

About AFS:

> If there is significant packet loss on the connection, it will go slower
> still.

My feeling is that #define RX_MAX_FRAG 1 instead of 4 does make things
behave better if there is packet loss to be expected.

About xDSL:

It might be the case that the throttling of TCP compared to the throttling
of rx (over UDP) looses when xDSL is involved. That is very difficult to
predict without actually monitoring the packets on the wire in question.

Another guess: It might be that your xDSL allways behaves shitty (like
gets very long latency) when it gets near full. It might be that your
provicer tunnels your xDSL over some other transport somewhere.