ipv4: take rt_uncached_lock only if needed

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Multicast traffic allocates dst with DST_NOCACHE, but dst is
not inserted into rt_uncached_list.

This slowdown multicast workloads on SMP because rt_uncached_lock is
contended.

Change the test before taking the lock to actually check the dst
was inserted into rt_uncached_list.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric Dumazet 2012-08-24 05:40:47 +00:00 • committed by David S. Miller

parent a0dfb2634e

commit 78df76a065

1 changed files with 1 additions and 1 deletions

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net/ipv4/route.c

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