https://bugzilla.kernel.org/show_bug.cgi?id=201753 --- Comment #11 from David Coe (david.coe@xxxxxxxxxx) --- Good morning again! I've rebuilt the Ubuntu 20.10 kernel 5.8.0-44 overnight with increased delays. Grep'ing dmesg for IOMMU gives: 20 msec delay: [ 0.506947] pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter. [ 0.510822] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40 [ 0.764160] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@xxxxxxx> 30 & 40 msec delay: [ 1.017676] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported [ 1.021591] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40 [ 1.023053] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank). [ 1.345196] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@xxxxxxx> At least on my 2400G platform, that suggests 20 msec is still too short. Of course, YMMV :-). Machines are grinding through the same trial on Ubuntu 21.04 alpha's 5.10.11 kernel and I'll post results in due course. Best regards David -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
