Ethernet speed increases when micro USB 2.0 connector is connected

Thanks for the reply!

How can I change sclk? Is there any command like changing CPU frequency or should I see the device tree source file for sclk settings?

You can try to set sclk floor.

sudo -s
echo 1 >/sys/kernel/debug/clock/floor.sclk/state
cat /sys/kernel/debug/clock/floor.sclk/max > /sys/kernel/debug/clock/floor.sclk/rate

I tested the sclk setting above, and it seems to solve the Ethernet speed problem. Thank you very much!

Btw, what is the reason for not using the maximum clock in default? Lower power consumption?