Re: [Xen-devel] More on networking hang

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

> Not sure what the best solution is: when we were doing evaluation
> tests for our paper we disabled connection tracking (which means that
> things like NAT are unavailable). I haven't looked around, but there
> may well be a way to tell Linux to reuse TCBs in TIME WAIT state.

More detail:

Look in /proc/net/ip_conntrack. Most likely you'll see lots of
connects in TIME_WAIT.

You can adjust the maximum number of tracked connections by echoing to
/proc/sys/net/ipv4/ip_conntrack_max. A better solution, however, is
probably to modify the individual timeout values for each state. For
example:

 echo "5" >/proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_time_wait

[disclaimer: I haven't tried this myself, but google + src indicates
 this is the most promising approach.]

 -- Keir


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