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Message-ID: <2474fa1b-c69f-22e8-3358-937457667262@ucloud.cn>
Date: Thu, 5 Dec 2019 11:41:35 +0800
From: wenxu <wenxu@...oud.cn>
To: Roi Dayan <roid@...lanox.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Saeed Mahameed <saeedm@...lanox.com>
Subject: Re: Bad performance for VF outgoing in offloaded mode
On 12/4/2019 9:50 PM, Roi Dayan wrote:
>
> On 2019-11-28 7:03 AM, wenxu wrote:
>> 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
>>
>>
> Hi Wenxu,
>
> We didn't notice this behavior.
> Could it be your VM doesn't have enough resources to generate the traffic?
> As a listener it's only sending the acks.
Sorry, I found it is the problem of remote 10.0.0.241 server.
>
> Thanks,
> Roi
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