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author | 2016-12-08 11:41:56 -0800 | |
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committer | 2016-12-09 22:12:21 -0500 | |
commit | 6b229cf77d683f634f0edd876c6d1015402303ad (patch) | |
tree | ec877d3e324da74f7bbb179d4cd4a8db0172865c /tools/perf/scripts/python/export-to-postgresql.py | |
parent | udp: copy skb->truesize in the first cache line (diff) | |
download | wireguard-linux-6b229cf77d683f634f0edd876c6d1015402303ad.tar.xz wireguard-linux-6b229cf77d683f634f0edd876c6d1015402303ad.zip |
udp: add batching to udp_rmem_release()
If udp_recvmsg() constantly releases sk_rmem_alloc
for every read packet, it gives opportunity for
producers to immediately grab spinlocks and desperatly
try adding another packet, causing false sharing.
We can add a simple heuristic to give the signal
by batches of ~25 % of the queue capacity.
This patch considerably increases performance under
flood by about 50 %, since the thread draining the queue
is no longer slowed by false sharing.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions