netdev - Bad performance for VF outgoing in offloaded mode

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Date:   Thu, 28 Nov 2019 13:03:06 +0800
From:   wenxu <wenxu@...oud.cn>
To:     Roi Dayan <roid@...lanox.com>
Cc:     netdev@...r.kernel.org, saeedm@...lanox.com
Subject: Bad performance for VF outgoing in offloaded mode

Hi mellanox team,


I did a performance test for tc offload with upstream kernel:

I setup a vm with a VF as eth0

In the vm:

ifconfig eth0 10.0.0.75/24 up


On the host the mlx_p0 is the pf representor and mlx_pf0vf0 is the vf representor

The device in the switchdev mode

# grep -ri "" /sys/class/net/*/phys_* 2>/dev/null
/sys/class/net/mlx_p0/phys_port_name:p0
/sys/class/net/mlx_p0/phys_switch_id:34ebc100034b6b50
/sys/class/net/mlx_pf0vf0/phys_port_name:pf0vf0
/sys/class/net/mlx_pf0vf0/phys_switch_id:34ebc100034b6b50
/sys/class/net/mlx_pf0vf1/phys_port_name:pf0vf1
/sys/class/net/mlx_pf0vf1/phys_switch_id:34ebc100034b6b50


The tc filter as following: just forward ip/arp packets  in mlx_p0 and mlx_pf0vf0 each other

tc qdisc add dev mlx_p0 ingress
tc qdisc add dev mlx_pf0vf0 ingress

tc filter add dev mlx_pf0vf0 pref 2 ingress  protocol ip flower skip_sw action mirred egress redirect dev mlx_p0
tc filter add dev mlx_p0 pref 2 ingress  protocol ip flower skip_sw action mirred egress redirect dev mlx_pf0vf0

tc filter add dev mlx_pf0vf0 pref 1 ingress  protocol arp flower skip_sw action mirred egress redirect dev mlx_p0
tc filter add dev mlx_p0 pref 1 ingress  protocol arp flower skip_sw action mirred egress redirect dev mlx_pf0vf0


The remote server device eth0:

ifconfig eth0 10.0.0.241/24


test case 1:   tcp recieve from VF to PF

In the vm: iperf -s

On the remote server:

iperf -c 10.0.0.75 -t 10 -i 2
------------------------------------------------------------
Client connecting to 10.0.0.75, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local 10.0.0.241 port 59708 connected with 10.0.0.75 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 2.0 sec  5.40 GBytes  23.2 Gbits/sec
[  3]  2.0- 4.0 sec  5.35 GBytes  23.0 Gbits/sec
[  3]  4.0- 6.0 sec  5.46 GBytes  23.5 Gbits/sec
[  3]  6.0- 8.0 sec  5.10 GBytes  21.9 Gbits/sec
[  3]  8.0-10.0 sec  5.36 GBytes  23.0 Gbits/sec
[  3]  0.0-10.0 sec  26.7 GBytes  22.9 Gbits/sec


Good performance with offload.

# tc -s filter ls dev mlx_p0 ingress
filter protocol arp pref 1 flower chain 0
filter protocol arp pref 1 flower chain 0 handle 0x1
  eth_type arp
  skip_sw
  in_hw in_hw_count 1
    action order 1: mirred (Egress Redirect to device mlx_pf0vf0) stolen
     index 4 ref 1 bind 1 installed 971 sec used 82 sec
     Action statistics:
    Sent 420 bytes 7 pkt (dropped 0, overlimits 0 requeues 0)
    Sent software 0 bytes 0 pkt
    Sent hardware 420 bytes 7 pkt
    backlog 0b 0p requeues 0

filter protocol ip pref 2 flower chain 0
filter protocol ip pref 2 flower chain 0 handle 0x1
  eth_type ipv4
  skip_sw
  in_hw in_hw_count 1
    action order 1: mirred (Egress Redirect to device mlx_pf0vf0) stolen
     index 2 ref 1 bind 1 installed 972 sec used 67 sec
     Action statistics:
    Sent 79272204362 bytes 91511261 pkt (dropped 0, overlimits 0 requeues 0)
    Sent software 0 bytes 0 pkt
    Sent hardware 79272204362 bytes 91511261 pkt
    backlog 0b 0p requeues 0

#  tc -s filter ls dev mlx_pf0vf0 ingress
filter protocol arp pref 1 flower chain 0
filter protocol arp pref 1 flower chain 0 handle 0x1
  eth_type arp
  skip_sw
  in_hw in_hw_count 1
    action order 1: mirred (Egress Redirect to device mlx_p0) stolen
     index 3 ref 1 bind 1 installed 978 sec used 88 sec
     Action statistics:
    Sent 600 bytes 10 pkt (dropped 0, overlimits 0 requeues 0)
    Sent software 0 bytes 0 pkt
    Sent hardware 600 bytes 10 pkt
    backlog 0b 0p requeues 0

filter protocol ip pref 2 flower chain 0
filter protocol ip pref 2 flower chain 0 handle 0x1
  eth_type ipv4
  skip_sw
  in_hw in_hw_count 1
    action order 1: mirred (Egress Redirect to device mlx_p0) stolen
     index 1 ref 1 bind 1 installed 978 sec used 73 sec
     Action statistics:
    Sent 71556027574 bytes 47805525 pkt (dropped 0, overlimits 0 requeues 0)
    Sent software 0 bytes 0 pkt
    Sent hardware 71556027574 bytes 47805525 pkt
    backlog 0b 0p requeues 0



test case 2:  tcp send from VF to PF

On the reomte server: iperf -s

in the vm:

# iperf -c 10.0.0.241 -t 10 -i 2

------------------------------------------------------------
Client connecting to 10.0.0.241, TCP port 5001
TCP window size:  230 KByte (default)
------------------------------------------------------------
[  3] local 10.0.0.75 port 53166 connected with 10.0.0.241 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 2.0 sec   939 MBytes  3.94 Gbits/sec
[  3]  2.0- 4.0 sec   944 MBytes  3.96 Gbits/sec
[  3]  4.0- 6.0 sec  1.01 GBytes  4.34 Gbits/sec
[  3]  6.0- 8.0 sec  1.03 GBytes  4.44 Gbits/sec
[  3]  8.0-10.0 sec  1.02 GBytes  4.39 Gbits/sec
[  3]  0.0-10.0 sec  4.90 GBytes  4.21 Gbits/sec


Bad performance with offload.  All the packet are offloaded. 

It is the offload problem in the hardware?


BR

wenxu