Messages in this thread | | | Date | Tue, 14 Apr 2009 14:27:34 +0200 | From | Patrick McHardy <> | Subject | Re: [PATCH] netfilter: use per-cpu spinlock rather than RCU |
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Stephen Hemminger wrote: > This is an alternative version of ip/ip6/arp tables locking using > per-cpu locks. This avoids the overhead of synchronize_net() during > update but still removes the expensive rwlock in earlier versions. > > The idea for this came from an earlier version done by Eric Duzamet. > Locking is done per-cpu, the fast path locks on the current cpu > and updates counters. The slow case involves acquiring the locks on > all cpu's. > > The mutex that was added for 2.6.30 in xt_table is unnecessary since > there already is a mutex for xt[af].mutex that is held. > > Tested basic functionality (add/remove/list), but don't have test cases > for stress, ip6tables or arptables.
Thanks Stephen, I'll do some testing with ip6tables.
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