Commits
jbaron@akamai.com committed d1dd9119308
macvlan: optimize the receive path
The netif_rx() call on the fast path of macvlan_handle_frame() appears to
be there to ensure that we properly throttle incoming packets. However, it
would appear as though the proper throttling is already in place for all
possible ingress paths, and that the call is redundant. If packets are arriving
from the physical NIC, we've already throttled them by this point. Otherwise,
if they are coming via macvlan_queue_xmit(), it calls either
'dev_forward_skb()', which ends up calling netif_rx_internal(), or else in
the broadcast case, we are throttling via macvlan_broadcast_enqueue().
The test results below are from off the box to an lxc instance running macvlan.
Once the tranactions/sec stop increasing, the cpu idle time has gone to 0.
Results are from a quad core Intel E3-1270 V2@3.50GHz box with bnx2x 10G card.
for i in {10,100,200,300,400,500};
do super_netperf $i -H $ip -t TCP_RR; done
Average of 5 runs.
trans/sec trans/sec
(3.17-rc7-net-next) (3.17-rc7-net-next + this patch)
---------- ----------
208101 211534 (+1.6%)
839493 850162 (+1.3%)
845071 844053 (-.12%)
816330 819623 (+.4%)
778700 789938 (+1.4%)
735984 754408 (+2.5%)
Signed-off-by: Jason Baron <jbaron@akamai.com>
Signed-off-by: David S. Miller <davem@davemloft.net>