[LARTC] About sockets in "CLOSING" state

[Andy Furniss]

Denis Potapov wrote:
> Hi,
> 
> I have met the problem: when I use the shaping discipline 
> 
> tc qdisc add dev ppp0 parent 1:2 tbf latency 50ms burst 1450 rate 50kbit
> 
> one of my application (namely, "aMule") starts leaving sockets in
> "CLOSING" state. These sockets accumulate and do not disappear.
> Eventually I have so many of these dead sockets that the kernel warns
> "Out of socket memory" in syslog (That happens when I have more than
> 5000 dead sockets). 
> 
> When the discipline above canceled the problem disappears. Now the
> questions. 
> 
> 1. Is it problem of my application (=aMule) or QoS.
> 
> 2. Is there any way to eliminate these "dead" sockets out of kernel
>    memory, like "kill"?
> 
> Please, share if you have any ideas.

Using burst 1450 on tbf will drop all packets > 1449 bytes if your MTU 
is > 1449 then this could be the problem.

Andy.