On 8/31/16 13:57, Aaro Koskinen wrote: > This series implements multiple RX group support that should improve > the networking performance on multi-core OCTEONs. Basically we register > IRQ and NAPI for each group, and ask the HW to select the group for > the incoming packets based on hash. > > Tested on EdgeRouter Lite with a simple forwarding test using two flows > and 16 RX groups distributed between two cores - the routing throughput > is roughly doubled. > > Also tested with EBH5600 (8 cores) and EBB6800 (16 cores) by sending > and receiving traffic in both directions using SGMII interfaces. With this series on 4.4.19, rx works with receive_group_order > 0. Setting receive_group_order=4, I do see 16 Ethernet interrupts. I tried fiddling with various smp_affinity values (e.g. setting them all to ffffffff, or assigning a different one to each interrupt, or giving a few to some and a few to others), as well as different values for rps_cpus. 10-thread parallel iperf performance varies between 0.5 and 1.5 Gbit/sec total depending on the particular settings. With the SDK kernel I get over 8 Gbit/sec. It seems to be achieving that using just one interrupt (not even a separate one for tx, as far as I can tell) pegged to CPU 0 (the default smp_affinity). I must be missing some other major configuration tweak, perhaps specific to 10G. Can you run a test on the EBB6800 with the interfaces in 10G mode? --Ed _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
