Hi Alex!
Herewith a summary of our accumulated results [1] for Surajee's IOMMU
patch using 20 msecs wait and logged retries on AMD's Ryzen:
Ryzen KernelColdWarm
4700U 5.11.0-116 1
3500U 5.11.7 5 6
2500U 5.8.0-455
I've just tried Surajee's patch on Ubuntu's latest kernel 5.11.0-11 for
upcoming Hirsute and it consistently unlatches IOMMU after 6 x 20 msec
tries on my Ryzen 2400G. Mainline 5.12-rc2 gave identical results.
Paul Menzel too gets failure even after 10 x 20 msecs on a 2200G and
regards so long a d
Hi Alex!
There are further results [1] for Suravee's patch on Ryzen 2500U
(BubuXP) and 2400G (myself). Both show a slight difference between cold
boot (retry 5 x 20 msecs = success) and warm boot (retry 6 x 20 msecs =
failure).
It would be worth (even slightly) increasing the number of retries
sh
Hi Alex!
A splendidly prompt piece of cherry-picking. Many thanks.
I've checked your test release on my Ryzen 2400G on current Ubuntu 20.10 and it
still gives the diagostic:
AMD-Vi: Unable to read/write to IOMMU perf counter
It's to be expected! The little crew engaged with testing Suravee
Su
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