* [PATCH 0/3] ipv4 metrics super-sharing
@ 2011-01-28 22:35 David Miller
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From: David Miller @ 2011-01-28 22:35 UTC (permalink / raw)
To: netdev
As I mentioned a few days ago, we can "super-share" the metrics
in the most common case, which is that there are not explicit
metrics set for a route.
This makes the metrics all zero, which means we can just alias
the pointer to dst_default_metrics.
Most importantly, this means we avoid atomics on the fib_info ref
count at dst destroy time.
Depending upon the configuration, this can also save a non-trivial
amount of memory in the routing tables. Honestly, I doubt that
sites entertaining routing tables with hundreds of thousands of
routes have any non-zero metrics specified. :-)
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2011-01-28 22:35 [PATCH 0/3] ipv4 metrics super-sharing David Miller
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