linux-kernel - Re: [PATCH 2/2] iommu/amd: Remove performance counter pre-initialization test

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Message-ID: <VI1PR09MB2638CE523F2E7E2DF4A6B087C74E9@VI1PR09MB2638.eurprd09.prod.outlook.com>
Date:   Wed, 14 Apr 2021 23:18:00 +0100
From:   David Coe <david.coe@...e.co.uk>
To:     "Suthikulpanit, Suravee" <suravee.suthikulpanit@....com>,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, will@...nel.org, jsnitsel@...hat.com,
        pmenzel@...gen.mpg.de, Jon.Grimm@....com,
        Tj <ml.linux@...oe.vision>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Alexander Monakov <amonakov@...ras.ru>,
        Alex Hung <1917203@...s.launchpad.net>
Subject: Re: [PATCH 2/2] iommu/amd: Remove performance counter
 pre-initialization test

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

View attachment "4700U-5.11.0-14.txt" of type "text/plain" (5661 bytes)