topic Re: imx6q with linux 4.1.6 select() timeout in i.MX Processors

imx6q with linux 4.1.6 select() timeout

zhongxing_zhao — Wed, 13 Mar 2019 06:26:51 GMT

Recently ,i got a problem in imx6q,with linux version 4.1.6.

The one side is arm linux(imx6q) as tcp client ,and other is pc computer as tcp server(server port:31122),the client connected to server and then receive data from server in fixed interval time ,like 5ms. The most of time, the select works fine,but sometimes the select() continuous returns zero.

Does anyone can give me any suggestion? thanks a lot.

Follows snippets are logs when error happened.

select timeout
select timeout
select timeout
select timeout
rcv data len 16384 , delta time = 3768
rcv data len 16384 , delta time = 0
rcv data len 14802 , delta time = 0
rcv data len 16384 , delta time = 3
rcv data len 16384 , delta time = 0
rcv data len 16384 , delta time = 0
rcv data len 16384 , delta time = 1
rcv data len 16384 , delta time = 0
rcv data len 16384 , delta time = 0
rcv data len 16384 , delta time = 0
rcv data len 16384 , delta time = 0
rcv data len 16384 , delta time = 0
rcv data len 16384 , delta time = 0
rcv data len 16384 , delta time = 0
rcv data len 16384 , delta time = 0
rcv data len 16384 , delta time = 0
rcv data len 3088 , delta time = 0

Re: imx6q with linux 4.1.6 select() timeout

zhongxing_zhao — Wed, 13 Mar 2019 06:33:26 GMT

From the grab logs, the frozen time lasts 1 second or 2 seconds,even more longer.

And some logs not uploaded here.

Re: imx6q with linux 4.1.6 select() timeout

igorpadykov — Wed, 13 Mar 2019 10:20:18 GMT

Hi zhongxing

for improving ethernet stability one can look at suggestions on

i.MX6 Gigabit Ethernet - Boundary Devices

Best regards
igor
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