https://bugs.kde.org/show_bug.cgi?id=523458

--- Comment #3 from mfp <[email protected]> ---
Well, the plot thickens. Or I guess solves itself, from your POV.
TL;DR: Not a software issue (or not in dolphin nor smbclient) but a network
issue at peak bandwidth.
The "reasonable default socket options" I asked you to implement just reduced
the performance enough to not hit that peak.
Sorry for wasting everyone's time. 

While I kept trying to find new tests and experiments to figure out the issue,
I noticed my wifi speeds in system monitor briefly get well beyond the 40MB/s
dolphin was reporting, to actually 80MB/s briefly right before the
interruption. This led me to search for ways to test my network without
involving SMB, and finding out about iperf3. With the iperf test I get the same
spike to 80MB/s then stall to 0. I'll still need to do more debugging to figure
it out but at least it's clear it's not related to what I thought originally at
all.

The only thing left for you to check is the possible usage of an error code as
a size thing.
QIODevice::write (QFile, "/path/to/file.part"): Called with maxSize < 0
That's such a stray tangent from the original post tho that IDK if I should
even leave the issue open waiting for anyone to see it.

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