UDP queue size

[Nick Craig-Wood]

§ä´M¦Û¤vªº¤@¤ù¤Ñ <command.bbs at alexbbs.twbbs.org> wrote:
>  I got a problem about UDP.
> 
>  How do I get the UDP buffer size?
> 
>  When the server had some delay in handling incoming UDP, it will lost
>  some package. I wonder it's because the system buffer size, is there any
>  ways to find the exactly size of the buffer?
> 
>  ex:
> 
>  client.py
>  import socket
> 
>  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
>  for i in xrange(1000):
>      s.sendto('xxx', ('192.168.1.135',10000))
> 
> 
> 
>  server.py: in ip (192.168.1.135)
>  import socket
>  import time
>  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
>  s.bind(('',10000))
>  time.sleep(10)
> 
>  # here will only recv 255 package, others are lost...
>  for i in xrange(1000):
>      msg, addr = s.recvfrom(500)
>      print i

I think you want setsockopt...

>>> import socket
>>> import time
>>> s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
>>> s.bind(('',10000))
>>> s.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF)
112640
>>> s.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, 1048576)
>>> s.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF)
262142
>>>

I ran the above on linux and I expect the limit 262144 is settable in
/proc/sys/net somewhere.

No idea whether the above works on windows!


-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick