On Sat, Sep 23, 2023 at 9:22 AM Rich Freeman <rich0@gentoo.org> wrote:
>
> On Sat, Sep 23, 2023 at 8:04 AM Dale <rdalek1967@gmail.com> wrote:
> >
> > I'm expecting more of a consistent throughput instead of all the
> > idle time.  The final throughput is only around 29.32MB/s according to
> > info from rsync.  If it was not stopping all the time and passing data
> > through all the time, I think that would improve.  Might even double.
>
> Is anything else reading data from the NAS at the same time?  The
> performance is going to depend on a lot of details you haven't
> provided, but anything that reads from a hard disk is going to
> significantly drop throughput - probably to levels around what you're
> seeing.
>
> That seems like the most likely explanation, assuming you don't have
> some older CPU or a 100Mbps network port, or something else like WiFi
> in the mix.  The bursty behavior is likely due to caching.
>
> --
> Rich

Let's not forget that Dale also likes to put layers of things on his
drives, LVM & encryption at a minimum. We also don't know anything
about his block sizes at either end of this pipe.

I would think maybe running iotop AND btop on both ends would give some
clues on timing. Is the time when gkrellm is idle due to the host disk not
responding or the target getting flooded with too much data?

- Mark