Le mardi 08 juin 2010 à 16:29 +0200, Patrick McHardy a écrit :
quoted text
> On 04.06.2010 22:15, Eric Dumazet wrote:
> > NOTRACK makes all cpus share a cache line on nf_conntrack_untracked
> > twice per packet, slowing down performance.
> > 
> > This patch converts it to a per_cpu variable.
> > 
> > We assume same cpu is used for a given packet, entering and exiting the
> > NOTRACK state.
> 
> That doesn't seem to be a valid assumption, the conntrack entry is
> attached to the skb and processing in the output path might get
> preempted and rescheduled to a different CPU.

Thats unfortunate.

Ok, only choice then is to not change refcount on the untracked ct, and
keep a shared (read only after setup time) untrack structure.





--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html