strange behavior of sk_rmem_alloc

strange behavior of sk_rmem_alloc

[sugnan prabhu]

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
*sk_rcvqueues_full(sk,skb)
*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.

http://www.pubbs.net/200912/kernel/700-seeing-strange-values-for-tcp-skrmemalloc.html

<http://www.pubbs.net/200912/kernel/700-seeing-strange-values-for-tcp-skrmemalloc.html>In
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
http://sugnanprabhu.blogspot.com/
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strange behavior of sk_rmem_alloc

[sugnan prabhu]

Hello,

    The issue got resolved the skb references were not handled properly, now
its working fine after correcting few handling. Thank you

On Wed, Dec 29, 2010 at 9:34 AM, sugnan prabhu <sugnan.prabhu@gmail.com>wrote:

>
> 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 *sk_rcvqueues_full(sk,skb)
> *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.
>
>
> http://www.pubbs.net/200912/kernel/700-seeing-strange-values-for-tcp-skrmemalloc.html
>
> <http://www.pubbs.net/200912/kernel/700-seeing-strange-values-for-tcp-skrmemalloc.html>In
> 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
> http://sugnanprabhu.blogspot.com/
>
>
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