[Bug 1281366] Re: ip command becomes slower with large number of network devices

[ThorstenK]

Hello Brian,

just upgraded from  20111117-1ubuntu2.1 to 20111117-1ubuntu2.2 an
noticed that 'ip route' reports wrong interface device names ( if2
instead of eth0):

1ubuntu2.1:
root at maumau:/etc/apt# ip route show
default via abc.def.39.254 dev eth0  metric 100 
abc.def.32.0/21 dev eth0  proto kernel  scope link  src abc.def.32.251 
169.254.0.0/16 dev eth0  scope link  metric 1000

1ubuntu2.2:
root at maumau:/etc/apt# ip route show
default via abc.def.39.254 dev if2  metric 100 
abc.def.32.0/21 dev if2  proto kernel  scope link  src abc.def.32.251 
169.254.0.0/16 dev if2  scope link  metric 1000

Looks like the fix is not complete. Thanks. Thorsten

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https://bugs.launchpad.net/bugs/1281366

Title:
  ip command becomes slower with large number of network devices

Status in “iproute” package in Ubuntu:
  Fix Released
Status in “iproute” source package in Precise:
  Fix Committed
Status in “iproute” source package in Quantal:
  Fix Committed

Bug description:
  [Impact]
  When using iproute commands with a large number of network devices (virtual ethernet adapters, etc) iproute performance becomes much slower.

  [Test Case]
  1) Download attached 'make_fake_routers.sh' and 'parse.py' scripts.
  2) ./make_fake_routers.sh 3000 ip > results
  3) ./parse.py results

  You should be able to graph and clearly see a performance improvement
  with the fix than without it.

  [Regression Potential]
  This patch fixes the issue:
  https://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/commit/?id=f0124b0f0aa0e5b9288114eb8e6ff9b4f8c33ec8
  This patch is upstream and is currently in saucy and beyond.

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