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I have installed

  • postfix
  • dovecot
  • fail2ban
  • postgray

daemons on top of the Linux mail 4.14.98+ #1200 Tue Feb 12 20:11:02 GMT 2019 armv6l GNU/Linux

Also, I have connected rpi0 to another rpi over usb-otg (to have a serial and ethernet access).

Unfortunately, even though rpi0 has low load, when ssh to it, every typing takes seconds, and in lot cases connection break due to timeout.

  CPU[#*                        3.2%]   Tasks: 54, 17 thr; 1 running
  Mem[|||||||####*********87.6M/433M]   Load average: 0.02 0.04 0.05
  Swp[                         0K/0K]   Uptime: 23 days, 02:36:02

When I connect to rpi0 via serial link - everything works fine, no delays, no timeouts.

So, question is -- which software may cause a delay?

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  • Please connect your devices and put the dmesg or /var/log/syslog output here and your boot cmdline.txt for more informations, because here it is very difficult.Maybe a conlict with the ethernet gadget and the serial interface ? learn.adafruit.com/… learn.adafruit.com/… raspberrypi.stackexchange.com/questions/67907/… – Ephemeral Jun 1 '19 at 10:05
  • As you can see on Adafruit tutorial, it is an ethernet gadget OR a serial gadget... I don't known if you can use in the the same time two gadgets. good question. – Ephemeral Jun 1 '19 at 10:08
  • But Serial can be acceded by USB from here you see how to : hackaday.com/2016/02/25/… – Ephemeral Jun 1 '19 at 10:12
  • You need COMPOSITE USB GADGETS from TOBIAS > Want your Pi Zero to emulate a keyboard, ethernet adapter, serial > device, mass storage, and many more at the same time? This tutorial is > for you! Tutorial – Ephemeral Jun 1 '19 at 10:20
  • It is possible to have both ethernet and serial using g_cdc – Andrii Zhuk Jun 1 '19 at 18:46
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Uncommenting the following line in /etc/ssh/sshd_config did the trick for me, and my ssh session were not slow anymore afterwards:

UseDNS no

Don't forget to restart the ssh service after modifying the config file:

service ssh restart

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