Bug 422747

Hi there, I'm experiencing a weird glitch when transferring files (via WiFI) from a *mounted* CIFS share on my LAN. The ksysguard main window and the "Netspeed Widget" I have in my panel normally seem to refresh about 1x/second. But when transferring files to/from `/mnt/NAS/` they start to freeze and stutter, sometimes for ~5 seconds, and they they recover and update and then freeze again for the entire duration of the file transfer. This happens when transferring LAN files with Dolphin *and* via the command line. The rest of the OS remains responsive, though. My network is slow, via WiFI it can only do about 7 MiB/s max, so it shouldn't be a core I/O scheduler problem, and I have a relatively fast SSD. At any rate, my `/sys/block/sda/queue/scheduler` is [bfq].

Also I tested this using the normal KIO CIFS access through Dolphin, and this bug does *not* occur. However, due to bug #291835 the transfer speed is less than 50% of what a normal CIFS mount achieves.

Thanks for the help!

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Operating System: openSUSE Tumbleweed 20200609
KDE Plasma Version: 5.19.0
KDE Frameworks Version: 5.70.0
Qt Version: 5.15.0
Kernel Version: 5.6.14-1-default
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-3320M CPU @ 2.60GHz
Memory: 7.5 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4000