diff options
author | Stephen Hemminger <shemminger@vyatta.com> | 2009-04-28 22:36:33 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2009-04-28 22:36:33 -0700 |
commit | 942e4a2bd680c606af0211e64eb216be2e19bf61 (patch) | |
tree | a83af49242d4a8d53aa0f3b5814eb17da72edc09 /include/linux/init_ohci1394_dma.h | |
parent | bf368e4e70cd4e0f880923c44e95a4273d725ab4 (diff) |
netfilter: revised locking for x_tables
The x_tables are organized with a table structure and a per-cpu copies
of the counters and rules. On older kernels there was a reader/writer
lock per table which was a performance bottleneck. In 2.6.30-rc, this
was converted to use RCU and the counters/rules which solved the performance
problems for do_table but made replacing rules much slower because of
the necessary RCU grace period.
This version uses a per-cpu set of spinlocks and counters to allow to
table processing to proceed without the cache thrashing of a global
reader lock and keeps the same performance for table updates.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/init_ohci1394_dma.h')
0 files changed, 0 insertions, 0 deletions