Hi again!

For completeness, I'm attaching results for the revert+update patch 
running the Ubuntu 21.04β kernel 5.11.0-14 on a Ryzen 4700U laptop.

The enormous amd_iommu running stats aren't always there, as they nearly 
always are on the the 2400G desktop, but they do turn up (depending on 
what the machine's been doing).

Be very interested in your thoughts on their relevance!

Best regards,

-- 
David