Le mardi 08 juin 2010 à 16:29 +0200, Patrick McHardy a écrit :

On 04.06.2010 22:15, Eric Dumazet wrote:

quoted

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.





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