ipv6: factorize sk_wmem_alloc updates done by __ip6_append_data()

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While testing my inet defrag changes, I found that the senders
could spend ~20% of cpu cycles in skb_set_owner_w() updating
sk->sk_wmem_alloc for every fragment they cook, competing
with TX completion of prior skbs possibly happening on another cpus.

The solution to this problem is to use alloc_skb() instead
of sock_wmalloc() and manually perform a single sk_wmem_alloc change.

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

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Eric Dumazet 2018-03-31 13:16:26 -07:00 • committed by David S. Miller

parent 694aba690d

commit 1f4c6eb240

1 changed files with 12 additions and 5 deletions

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net/ipv6/ip6_output.c

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