Subject: Re: [PATCH] netfilter: finer grained nf_conn locking

From: Stephen Hemminger <[email-masked]>
Date: Sat, 28 Mar 2009 17:48:35 -0700

On Sat, 28 Mar 2009 17:55:38 +0100
Eric Dumazet <[email-masked]> wrote:

> Eric Dumazet a écrit :
> > Patrick McHardy a écrit :
> >> Stephen Hemminger wrote:
> >>
> >>> @@ -50,6 +50,7 @@ struct ip_ct_tcp_state {
> >>>  
> >>>  struct ip_ct_tcp
> >>>  {
> >>> +    spinlock_t    lock;
> >>>      struct ip_ct_tcp_state seen[2];    /* connection parameters per
> >>> direction */
> >>>      u_int8_t    state;        /* state of the connection (enum
> >>> tcp_conntrack) */
> >>>      /* For detecting stale connections */
> >> Eric already posted a patch to use an array of locks, which is
> >> a better approach IMO since it keeps the size of the conntrack
> >> entries down.
> > 
> > Yes, we probably can use an array for short lived lock sections.

I am not a fan of the array of locks. Sizing it is awkward and
it is vulnerable to hash collisions. Let's see if there is another
better way.
--
To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in
the body of a message to [email-masked]
More majordomo info at  http://vger.kernel.org/majordomo-info.html