arp(8) performance w/ many aliases assigned to an interface

[Max Laier]

Hello Nick,

On Wednesday 09 June 2010 20:17:43 Nick Rogers wrote:
> Is there something that can be done to speedup the call to
> if_indextoname(), or would it be worthwhile for me to submit a patch that
> adds the ability to skip the interface lookup as an arp(8) option?

how about the attached:

# time arp -an > /dev/null
0.171u 0.462s 0:00.63 100.0%    21+1538k 0+0io 0pf+0w
# time arp.patched -an > /dev/null
0.005u 0.000s 0:00.00 0.0%      0+0k 0+0io 0pf+0w

# arp -an | wc -l
    1095

I'll commit this soon unless somebody objects.

Thanks for your report.
  Max
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