On úterý 20. února 2018 21:09:37 CET Eric Dumazet wrote: > Also you can tune your NIC to accept few MSS per GSO/TSO packet > > ip link set dev eth0 gso_max_segs 2 > > So even if TSO/GSO is there, BBR should not use sk->sk_gso_max_segs to > size its bursts, since burt sizes are also impacting GRO on the > receiver.
net-next + 7 patches (6 from the patchset + this one). Before playing with gso_max_segs: BBR+fq sg on: 4.39 Gbits/sec sg off: 1.33 Gbits/sec BBR+fq_codel sg on: 4.02 Gbits/sec sg off: 1.41 Gbits/sec BBR+pfifo_fast sg on: 3.66 Gbits/sec sg off: 1.41 Gbits/sec Reno+fq sg on: 5.69 Gbits/sec sg off: 1.53 Gbits/sec Reno+fq_codel sg on: 6.33 Gbits/sec sg off: 1.50 Gbits/sec Reno+pfifo_fast sg on: 6.26 Gbits/sec sg off: 1.48 Gbits/sec After "ip link set dev eth1 gso_max_segs 2": BBR+fq sg on: 806 Mbits/sec sg off: 886 Mbits/sec BBR+fq_codel sg on: 206 Mbits/sec sg off: 207 Mbits/sec BBR+pfifo_fast sg on: 220 Mbits/sec sg off: 200 Mbits/sec Reno+fq sg on: 2.16 Gbits/sec sg off: 1.27 Gbits/sec Reno+fq_codel sg on: 2.45 Gbits/sec sg off: 1.52 Gbits/sec Reno+pfifo_fast sg on: 2.31 Gbits/sec sg off: 1.54 Gbits/sec Oleksandr
