diff options
| author | David Held <drheld@google.com> | 2014-07-15 23:28:32 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-07-16 23:29:52 -0700 |
| commit | 2dc41cff7545d55c6294525c811594576f8e119c (patch) | |
| tree | cab09b28d188606139b1b50b661f42da157c52ba /net/ipv6/exthdrs_offload.c | |
| parent | 5cf3d46192fccf68b4a4759e4d7346e41c669a76 (diff) | |
udp: Use hash2 for long hash1 chains in __udp*_lib_mcast_deliver.
Many multicast sources can have the same port which can result in a very
large list when hashing by port only. Hash by address and port instead
if this is the case. This makes multicast more similar to unicast.
On a 24-core machine receiving from 500 multicast sockets on the same
port, before this patch 80% of system CPU was used up by spin locking
and only ~25% of packets were successfully delivered.
With this patch, all packets are delivered and kernel overhead is ~8%
system CPU on spinlocks.
Signed-off-by: David Held <drheld@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/exthdrs_offload.c')
0 files changed, 0 insertions, 0 deletions