Thank you for the suggestion to test mainline.
Regarding the kernel parameters: The test is run on the host and not in
a virtual machine, for completeness I have removed the iommu and vf
related kernel parameters and they do not affect the outcome of the
test.
Unfortunately using the mainline kernel does not appear to help on the
machines in question:
# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-5.7.0-050700rc7-generic
root=UUID=99527048-4021-4a56-a7d3-21c6cb761879 ro
# uname -a
Linux node-mees 5.7.0-050700rc7-generic #202005242331 SMP Sun May 24 23:33:19
UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
# cpufreq-info -o
...
CPU 47 1200000 kHz ( 41 %) - 2900000 kHz (100 %) - performance
# fio /usr/share/doc/fio/examples/fio-seq-write.fio
...
Run status group 0 (all jobs):
WRITE: bw=63.1MiB/s (66.2MB/s), 63.1MiB/s-63.1MiB/s (66.2MB/s-66.2MB/s),
io=60.0GiB (64.4GB), run=973234-973234msec
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1880943
Title:
[focal] disk I/O performance regression
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