Messages in this thread | | | Subject | Re: [PATCH 2/2] iommu/amd: Remove performance counter pre-initialization test | From | "Suthikulpanit, Suravee" <> | Date | Thu, 15 Apr 2021 16:28:16 +0700 |
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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
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