1. 21 Sep, 2017 25 commits
  2. 20 Sep, 2017 14 commits
  3. 19 Sep, 2017 1 commit
    • David S. Miller's avatar
      Merge branch 'net-speedup-netns-create-delete-time' · 8ca712c3
      David S. Miller authored
      Eric Dumazet says:
      
      ====================
      net: speedup netns create/delete time
      
      When rate of netns creation/deletion is high enough,
      we observe softlockups in cleanup_net() caused by huge list
      of netns and way too many rcu_barrier() calls.
      
      This patch series does some optimizations in kobject,
      and add batching to tunnels so that netns dismantles are
      less costly.
      
      IPv6 addrlabels also get a per netns list, and tcp_metrics
      also benefit from batch flushing.
      
      This gives me one order of magnitude gain.
      (~50 ms -> ~5 ms for one netns create/delete pair)
      
      Tested:
      
      for i in `seq 1 40`
      do
       (for j in `seq 1 100` ; do  unshare -n /bin/true >/dev/null ; done) &
      done
      wait ; grep net_namespace /proc/slabinfo
      
      Before patch series :
      
      $ time ./add_del_unshare.sh
      net_namespace        116    258   5504    1    2 : tunables    8    4    0 : slabdata    116    258      0
      
      real	3m24.910s
      user	0m0.747s
      sys	0m43.162s
      
      After :
      $ time ./add_del_unshare.sh
      net_namespace        135    291   5504    1    2 : tunables    8    4    0 : slabdata    135    291      0
      
      real	0m22.117s
      user	0m0.728s
      sys	0m35.328s
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8ca712c3