Igor Sysoev wrote:
It seems that FreeBSD can not make more than
net.inet.ip.portrange.last - net.inet.ip.portrange.first
simultaneous outgoing connections, i.e., no more than about 64k.
If I made ~64000 connections 127.0.0.1:XXXX > 127.0.0.1:80, then
connect() to an external address returns EADDRNOTAVAIL.
net.inet.ip.portrange.randomized is 0.
sockets, etc. are enough:
ITEM SIZE LIMIT USED FREE REQUESTS FAILURES
socket: 356, 204809, 13915, 146443, 148189452, 0
inpcb: 180, 204820, 20375, 137277, 147631805, 0
tcpcb: 464, 204800, 13882, 142102, 147631805, 0
tcptw: 48, 41028, 6493, 11213, 29804665, 0
I saw it on 6.2-STABLE.
In an ideal world (Not sure if this is quite correct for FreeBSD) TCP
connections are tracked with a pair of tupels source-addr:src-port ->
dst-addr:dst-port
As your always connecting to the same destination service 127.0.0.1:80
and always from the same source IP 127.0.0.1 then you only have one
variable left to change, the source port. If you where to use the hole
of the whole of the port range minus the reserved ports you would only
ever be able to make 64512 simultaneous connections. In order to make
more connections the first thing that you may want to start changing is
the source IP. If you added a second IP to you lo0 interface (say
127.0.0.2) and used a round robin approach to making your out bound
connections then you could make around 129k outbound connections.
I am not sure if there are any other constraints that need to be taken
into account such as the maximum number of sockets, RAM etc....
Tom
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