Revert "netfilter: x_tables: Switch synchronization to RCU"

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This reverts commit cc00bcaa58.

This (and the preceding) patch basically re-implemented the RCU
mechanisms of patch 784544739a. That patch was replaced because of the
performance problems that it created when replacing tables. Now, we have
the same issue: the call to synchronize_rcu() makes replacing tables
slower by as much as an order of magnitude.

Prior to using RCU a script calling "iptables" approx. 200 times was
taking 1.16s. With RCU this increased to 11.59s.

Revert these patches and fix the issue in a different way.

Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Mark Tomlinson 2021-03-08 14:24:12 +13:00 • committed by Pablo Neira Ayuso

parent abe7034b9a

commit d3d40f2374

5 changed files with 56 additions and 40 deletions

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include/linux/netfilter/x_tables.h

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