[kio] [Bug 357465] New: nfs async write causes CPU to spike 100%, plasma to freeze, incorrect write speed. Sync works however

[doug via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=357465

            Bug ID: 357465
           Summary: nfs async write causes CPU to spike 100%, plasma to
                    freeze, incorrect write speed. Sync works however
           Product: kio
           Version: unspecified
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: nfs
          Assignee: unassigned-bugs at kde.org
          Reporter: dougiemaca at gmail.com

Using a laptop with wireless connection to router
KDE Plasma Version: 5.5.2
QT Version 5.5.1
Kernel Version: 4.4.0-1-MANJARO
nfs-utils 1.3.3-3
fstab entry: 192.168.1.67:/volume1/share               /home/doug/NAS nfs    
vers=4,noauto,user,noatime,x-systemd.device-timeout=10,timeo=14,intr,soft 0 0

Hi there,

When copying large files to an nfs4 drive mounted as async the copying
notification plasmoid freezes, cpu maxes out, dolphin freezes, write speed in
the copying notification is incorrect and then disappears.

This can be worked around by mounting as sync in fstab but this has slower read
/ writes. Can the async behaviour be fixed? In other desktop environments
mounting as the default option async is not an issue.

*strangely if it is mounted as async copying files over from the nfs drive to
laptop does not seem to be a problem. Even the copy speed within the copying
notification is correct.

Reproducible: Always

Steps to Reproduce:
1. mount nfs4 drive as async on wireless laptop connection
2. copy large file to nfs drive 
3.

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