https://bugs.kde.org/show_bug.cgi?id=461745
Bug ID: 461745
Summary: doesn't report correct speed on btrfs raid 0 volume
Classification: Plasma
Product: plasma-systemmonitor
Version: 5.26.0
Platform: Neon
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: ksysguard-b...@kde.org
Reporter: sp...@gmx.com
CC: ahiems...@heimr.nl, plasma-b...@kde.org
Target Milestone: ---
SUMMARY
When drive/mountpoint to monitor is in btrfs raid0, read and writes speeds are
incorrect (seems to take only one of the drives in that raid)
DETAILS:
In my current case there's 2 drives in raid0 and plasma system Monitor reports
half the speed.
REPLICATE:
-have 2 free devices/partitions (for ex: sda2 sdb2)
-create the raid with them (mkfs.btrfs -L raid-test -d raid0 -m raid0 -f
/dev/sda2 /dev/sdb2)
-mount the raid (mount LABEL=raid-test /mountpoint)
Monitor that mountpoint while doing read/writes (for write example: dd
if=/dev/zero of=/mountpoint/GBfile bs=1M count=4096 oflag=nocache
conv=fdatasync status=progress )
expected behaviour:
the write (or read) speed should obviously be faster than a single drive
behaviour:
speed displayed is as if only one drive was used
Operating System: KDE neon 5.26
KDE Plasma Version: 5.26.0
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.7
Kernel Version: 5.15.0-52-generic (64-bit)
Graphics Platform: X11
Processors: 12 × Intel® Core™ i7-3930K CPU @ 3.20GHz
Memory: 62.7 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 980/PCIe/SSE2
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