not work in any command

[Hhk78]

it does not work in any command
error code:
trickle: Could not reach trickled, working independently: No such file or directory

[samsong8610]

This is just a warning message. You can use -s option to avoid it.
According to man 1 trickle, -s means running trickle in standalone mode, independent of trickled(8).

[Hhk78]

does not limit speed

[samsong8610]

does not limit speed

IMO, it is implemented by replacing socket related io methods in libc.so using LD_PRELOAD trick, so it really doesn't make sense if your target program does not use these methods.