How to get the queue length of the switch in mininet?

I enabled ECN, in the mininet network to see the queue length when the switch is marked with ECN=1. How can I get the queue length of the switch?

Queue switch-statement minimax
Mar.04,2021

Hello, has the problem been solved? I have the same problem

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e59f72-27aab.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e59f72-27aab.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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