strange behavior of sk_rmem_alloc

sugnan prabhu sugnan.prabhu at
Tue Dec 28 23:04:44 EST 2010

Hello all,

       I have written a network driver, address family and a protocol
family, when i create a socket in a user space program to my PF and AF, it
receives only first 300 packets and i see that all the packets are being
received till the function sk_recieve_skb() is called.
      When i tried searching for the root of the cause, i found that
*returns true after receiving 300 packets, further observing the cause i
found that the variable *sk_rmem_alloc* which is being checked in the
function in never getting decremented.

the above link i found that some one had similar problem, and as it says
calling *skb_copy_datagram_iovec()* should decrement the *sk_rmem_alloc*, am
even doing that. So can some suggest what can be the problem. One more
strange thing is *sk_queue_empty(&sk->receive_queue)* start returning true
after 300 packet.

Thanking You,
Sugnan Prabhu S
-------------- next part --------------
An HTML attachment was scrubbed...

More information about the Kernelnewbies mailing list