David, On 4/14/2021 10:33 PM, David Coe wrote: > Hi Suravee! > > I've re-run your revert+update patch on Ubuntu's latest kernel 5.11.0-14 > partly to check my mailer's 'mangling' hadn't also reached the code! > > There are 3 sets of results in the attachment, all for the Ryzen 2400G. The > as-distributed kernel already incorporates your IOMMU RFCv3 patch. > > A. As-distributed kernel (cold boot) > >5 retries, so no IOMMU read/write capability, no amd_iommu events. > > B. As-distributed kernel (warm boot) > <5 retries, amd_iommu running stats show large numbers as before. > > C. Revert+Update kernel > amd_iommu events listed and also show large hit/miss numbers. > > In due course, I'll load the new (revert+update) kernel on the 4700G but > won't overload your mail-box unless something unusual turns up. > > Best regards, >
For the Ryzen 2400G, could you please try with: - 1 event at a time - Not more than 8 events (On your system, it has 2 banks x 4 counters/bank. I am trying to see if this issue might be related to the counters multiplexing). Thanks, Suravee -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1917203 Title: AMD-Vi: Unable to read/write to IOMMU perf counter To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1917203/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
