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Visitor lvt
Visitor
332 Views
Registered: ‎07-18-2019

After 2018.3 jumbo frames causing big delay , but no big delay before 2018.2

Hi,everyone!  

Our recently project needs transfer 10000bytes between ZCU106 EvaluationKit with ubuntu PC (MTU=1500 fixed), 

occuring big delay.

 So, we do the following tests:

ping by below 1500bytes -> no big delay

・ping by 10000bytes(MTU=9000)   -> no big delay 

ping by 10000bytes(MTU=1500)   -> big delay  

However, the boss hope do not change the mtu size, as we found that when mtu=1500 

  Before 2018.2-zcu106-release.tar.xz   -> no big delay 

   After 2018.3-zcu106-release.tar.xz  -> big delay

Here is URL: "https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18842316/Zynq+Releases"

--> Who known why 2018.2-zcu106-release can transfer jumbo packet without changing MTU size?

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Visitor lvt
Visitor
154 Views
Registered: ‎07-18-2019

Re: After 2018.3 jumbo frames causing big delay , but no big delay before 2018.2

The response delay of ping on the ZCU106 evaluation board was summarized.

 

The content following is limited to ping's reply.

      summary_1125_ping.xlsx: test results

      memo_running.txt: test command

      pingn/udp_test: test program

 

There is obvious delay compared with board of i.mx 6, raspberry-PI3, or PC(ubuntu).

In addition, there is a significant reduction in latency when dummy packets are sent in parallel.

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Visitor lvt
Visitor
120 Views
Registered: ‎07-18-2019

Re: After 2018.3 jumbo frames causing big delay , but no big delay before 2018.2

Compared to what was submitted yesterday,

today we update the test results of summary_1125_ping.xlsx which is added additional survey results and English translation.

 

Then we got followings:

Inserting dummy packets at 10 ms intervals or less eliminates ping delay, but inserting dummy packets at 100 ms intervals does not eliminate ping delay.

Even with the latest version 2019.2-zcu106-release, the problem of ping delay is reproduced.

 

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