Public bug reported:
2. Loaded cxgb4 driver (No t6-config.txt file) and brought up the
interfaces.
3. Assigned IP address to Port0.
# ifconfig ens6f4 102.10.10.3/24 up
4. Configured the traffic rate of 10 Gbps on queue 0 using the below
command.
# echo 10000 > /sys/class/net/ens6f4/queues/tx-0/tx_maxrate
5. Created a filter rule using tc flower to match traffic(destined to IP
102.10.10.120) and bind it to a Tx Queue 0
# tc qdisc add dev ens6f4 root handle 1: multiq
# tc filter add dev ens6f4 parent 1: protocol ipv4 flower dst_ip
102.10.10.120 action skbedit queue_mapping 0
6. Traffic scenario,
On PEER : netserver -4
On TM machine :
1. Sent traffic using below command,
# rm -rf x ; for i in `seq 1 $N` ; do netperf -H 102.10.10.120 -l 30
>> x & done
Observation : I could see very less throughput for more than 9
connections( ~500 Mbps).
[root@buttercup ~]# tc -s filter show dev ens6f4
filter parent 1: protocol ip pref 49152 flower
filter parent 1: protocol ip pref 49152 flower handle 0x1
eth_type ipv4
dst_ip 102.10.10.120
not_in_hw
action order 1: skbedit queue_mapping 0 pipe
index 1 ref 1 bind 1 installed 1924 sec used 1515 sec
Action statistics:
Sent 79221007872 bytes 52337820 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Throughput values
======================================
---------------------------------------------------------
| Number of connections | Throughput got in (Mbps) |
---------------------------------------------------------
| 8 | 9489.85 |
---------------------------------------------------------
| 9 | 9490.37 |
---------------------------------------------------------
| 10 | 575.97 |
---------------------------------------------------------
| 16 | 503.14 |
---------------------------------------------------------
Environment
###########################
[root@buttercup ~]# ethtool -i ens6f4
driver: cxgb4
version: 2.0.0-ko
firmware-version: 1.24.3.0, TP 0.1.23.2
expansion-rom-version:
bus-info: 0000:81:00.4
supports-statistics: yes
supports-test: no
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes
Adapter : T6425-CR rev 0 (S/N: RE03170007, P/N: 11012136002)
Connectivity : Connected back-to-back with PEER T6225G-CR adapter.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1879435
Title:
[chelsio]cxgb4:Very less throughput with more than 9 connections when
rate limit is applied
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