Arend Van Spriel 於 6/22/2020 4:57 PM 寫道:
On 6/22/2020 4:07 AM, Wright Feng wrote:
Linux 3.6 introduces TSQ which has a per socket threshold for TCP Tx
packet to reduce latency. In flow control mode, host driver enqueues skb
in hanger and TCP doesn't push new skb frees until host frees the skb
when
receiving fwstatus event. So set pacing shift 8 to send them as a single
large aggregate frame to the bus layer.
43455 TX TCP throughput in FC mode 2 on Linux 5.4.18
sk_pacing_shift : Throughput
10: 190 Mbps
9: 216 Mbps
8: 233 Mbps (Max throughput)
7: 233 Mpbs
In this patch the pacing shift update is done irrespective of the FC
mode so I would like to see similar measurements for the other FC mode
configurations.
Measure 43455 TX TCP throughput again with different FC mode.
Here is the result and I will update result in patch v2.
43455 TX TCP throughput on Linux 5.4.18
FC mode 0
sk_pacing_shift : Throughput
10: 245 Mbps
9: 245 Mbps
8: 246 Mbps
7: 246 Mbps
FC mode 1
sk_pacing_shift : Throughput
10: 182 Mbps
9: 197 Mbps
8: 206 Mbps
7: 207 Mbps
FC mode 2
sk_pacing_shift : Throughput
10: 180 Mbps
9: 197 Mbps
8: 206 Mbps
7: 207 Mbps
Regards,
Arend
