netdev - [PATCH RFC 0/6] ipv6: dst_entry socket caching improvments

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Date:	Fri, 12 Sep 2014 01:21:47 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	netdev@...r.kernel.org
Subject: [PATCH RFC 0/6] ipv6: dst_entry socket caching improvments

Eric Dumazet noticed that rt6_nodes wich are neither RTF_NONEXTHOP nor
RTF_GATEWAY but DST_HOST ones cause major routing lookup churn because
their rt6_genid is never renewed, thus ip6_dst_check always considers
them outdated. This is a major problem, because these kind of routes
are normally used to in input handling.

This patchset tries to improve the situation by also updating the
fn_sernum in the routing tables during address deletion. The only
expensive operation left, which needs a walk over all routing tables,
are xfrm policy modifications.

I didn't annotate the patches with fixes-tags as it only solves a
performance issue. Please review carefully, thanks! I'll do some more
tests and will do a propoer submission if the xfrm slow paths looks ok
to everyone.

Hannes Frederic Sowa (6):
  ipv6: also increase fib6_node sernum on deletion events
  ipv6: no need to bump rt_genid_ipv6 on address change anymore
  ipv6: if no function for cleaner is specified only visit nodes
  ipv6: new function fib6_flush_trees and use it instead of bumping
    removed rt6_genid
  ipv6: keep rt_sernum per namespace to reduce number of flushes
  ipv6: switch rt_sernum to atomic_t and clean up types

 include/net/ip6_fib.h       |  2 +-
 include/net/net_namespace.h | 14 ++------
 include/net/netns/ipv6.h    |  2 +-
 net/ipv6/addrconf.c         |  1 -
 net/ipv6/addrconf_core.c    |  6 ++++
 net/ipv6/af_inet6.c         |  2 +-
 net/ipv6/ip6_fib.c          | 81 ++++++++++++++++++++++++++++++++-------------
 net/ipv6/route.c            |  4 ---
 8 files changed, 70 insertions(+), 42 deletions(-)

-- 
1.9.3

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