Commits
Dave Taht committed 2db6dc2662b
sch_cake: Make gso-splitting configurable from userspace
This patch restores cake's deployed behavior at line rate to always
split gso, and makes gso splitting configurable from userspace.
running cake unlimited (unshaped) at 1gigE, local traffic:
no-split-gso bql limit: 131966
split-gso bql limit: ~42392-45420
On this 4 stream test splitting gso apart results in halving the
observed interpacket latency at no loss in throughput.
Summary of tcp_nup test run 'gso-split' (at 2018-07-26 16:03:51.824728):
Ping (ms) ICMP : 0.83 0.81 ms 341
TCP upload avg : 235.43 235.39 Mbits/s 301
TCP upload sum : 941.71 941.56 Mbits/s 301
TCP upload::1 : 235.45 235.43 Mbits/s 271
TCP upload::2 : 235.45 235.41 Mbits/s 289
TCP upload::3 : 235.40 235.40 Mbits/s 288
TCP upload::4 : 235.41 235.40 Mbits/s 291
verses
Summary of tcp_nup test run 'no-split-gso' (at 2018-07-26 16:37:23.563960):
avg median # data pts
Ping (ms) ICMP : 1.67 1.73 ms 348
TCP upload avg : 234.56 235.37 Mbits/s 301
TCP upload sum : 938.24 941.49 Mbits/s 301
TCP upload::1 : 234.55 235.38 Mbits/s 285
TCP upload::2 : 234.57 235.37 Mbits/s 286
TCP upload::3 : 234.58 235.37 Mbits/s 274
TCP upload::4 : 234.54 235.42 Mbits/s 288
Signed-off-by: David S. Miller <davem@davemloft.net>