Re: AW: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6

Theodore Y. Ts'o
2019-12-23T17:23:33Z

On Mon, Dec 23, 2019 at 05:29:27PM +0100, Andrea Vai wrote:
> I run the cp command from a bash script, or from a bash shell. I don't
> know if this answer your question, otherwise feel free to tell me a
> way to find the answer to give you.

What distro are you using, and/or what package is the cp command
coming from, and what is the package name and version?

Also, can you remind me what the bash script is and how many files you are copying?

Can you change the script so that the cp command is prefixed by:

"strace -tTf -o /tmp/st "

e.g.,

strace -tTf -o /tmp/st cp <args>

And then send me the /tmp/st file. This will significantly change the
time, so don't do this for measuring performance. I just want to see
what the /bin/cp command is *doing*.

- Ted