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nxp-archive / openil

OpenIL is an open source project based on Buildroot and designed for embedded industrial solution.
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Ls1021 atsn qbv demo doesn’t work well #111

Open liing0228 opened 2 years ago

liing0228 commented 2 years ago

Hi @vladimiroltean , I follow the step ls1021atsn qbv demo in opening v1.10 user guide My qbv schedule on 1021 is: Basetime 0 0x80 50000 0x81 250000 0x40 100000 0x88 100000 Flag 2 My cycle time is 500000ns. I use three host all in kernel 5.4 that one is sender that send opcua realtime tsn punsub that sends multicast layer2 packet with priority 3 every 0.5ms,and one is the receiver that receive iperf and pubsub and last one is iperf3 launcher. However when I start use iperf3 the pubsub receiver packetloss rate can high to 3-10 % . When there is no iperf3 traffic the packet loss will be only 0.x%. I am pretty sure my ptp4l and phc2sys works well. And my pubsub sender Tx schedule is every 0.3ms in the 0.5ms cycle time . And the iperf3 result shows that the bandwidth been cut through half by the TAS. And I fount that the QoS protect the high priority packet better than TAS . So that I don’t know what’s wrong.

vladimiroltean commented 2 years ago

I don't understand this: "When there is no iperf3 traffic the packet loss will be only 0.x%." Why would you have any packet loss at all even with no background traffic? I think that's the problem you need to start looking at.

liing0228 commented 2 years ago

I don't understand this: "When there is no iperf3 traffic the packet loss will be only 0.x%." Why would you have any packet loss at all even with no background traffic? I think that's the problem you need to start looking at.

@vladimiroltean Sorry that I didn’t say clear . Actually that is no packet really loss. What i mean the loss% is that the packet didn’t arrive in the right time slot open. For example I send packet every 0.5ms but when there’s iperf3 traffic will 2-10% packet didn’t arrive in between 0.5 ms interval . When there is no iperf will only 0.x% packet didn’t arrive in 0.5ms