Subject: Re: [PATCH nf-next-2.6 2/2] conntrack: per_cpu untracking

From: Patrick McHardy <[email-masked]>
Date: Tue, 08 Jun 2010 16:29:24 +0200

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.