From: David S. Miller Date: Wed, 10 Sep 2014 04:29:50 +0000 (-0700) Subject: Merge branch 'ipip_sit_gro' X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6618ec6f742955dcddb71091ec461fbd5fec9fd3;p=linux-beck.git Merge branch 'ipip_sit_gro' Tom Herbert says: ==================== net: enable GRO for IPIP and SIT This patch sets populates the IPIP and SIT offload structures with gro_receive and gro_complete functions. This enables use of GRO for these. Also, fixed a problem in IPv6 where we were not properly initializing flush_id. Peformance results are below. Note that these tests were done on bnx2x which doesn't provide RX checksum offload of IPIP or SIT (i.e. does not give CHEKCSUM_COMPLETE). Also, we don't get 4-tuple hash for RSS only 2-tuple in this case so all the packets between two hosts are winding up on the same queue. Net result is the interrupting CPU is the bottleneck in GRO (checksumming every packet there). Testing: netperf TCP_STREAM between two hosts using bnx2x. * Before fix IPIP 1 connection 6.53% CPU utilization 6544.71 Mbps 20 connections 13.79% CPU utilization 9284.54 Mbps SIT 1 connection 6.68% CPU utilization 5653.36 Mbps 20 connections 18.88% CPU utilization 9154.61 Mbps * After fix IPIP 1 connection 5.73% CPU utilization 9279.53 Mbps 20 connections 7.14% CPU utilization 7279.35 Mbps SIT 1 connection 2.95% CPU utilization 9143.36 Mbps 20 connections 7.09% CPU utilization 6255.3 Mbps ==================== Signed-off-by: David S. Miller --- 6618ec6f742955dcddb71091ec461fbd5fec9fd3