cvs commit: src/sys/net bpf.c

[Brian Fundakowski Feldman]

On Thu, Aug 05, 2004 at 02:37:36AM +0000, Robert Watson wrote:
> rwatson     2004-08-05 02:37:36 UTC
> 
>   FreeBSD src repository
> 
>   Modified files:
>     sys/net              bpf.c 
>   Log:
>   Do a lockless read of the BPF interface structure descriptor list head
>   before grabbing BPF locks to see if there are any entries in order to
>   avoid the cost of locking if there aren't any.  Avoids a mutex lock/
>   unlock for each packet received if there are no BPF listeners.

While you're there, do you want to check out the other problems I've been
noticing, relating to consistency/locking?

-- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green at FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\