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    SubjectRe: AMD graphics performance regression in 4.15 and later
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    On 04/11/2018 05:37 AM, Christian König wrote:
    >> With your patches my EPYC box is unusable with  4.15++ kernels.
    >> The whole Desktop is acting weird.  This one is using
    >> an Cape Verde PRO [Radeon HD 7750/8740 / R7 250E] GPU.
    >>
    >> Box is  2 * EPYC 7281 with 128 GB ECC RAM
    >>
    >> Also a 14C Xeon box with a HD7700 is broken same way.
    >
    > The hardware is irrelevant for this. We need to know what software stack
    > you use on top of it.

    Well, the hardware appears to be part of the issue too. I don't think
    it's a coincidence that Gabriel has the problem on 2xEPYC, I have it on
    2xXeon and the previous reported had it on a Core 2 Quad that internally
    has two dies.

    I've not yet tested your disable CONFIG_SWIOTLB fix yet -- might try it
    over the weekend and report what happens.

    Cheers,

    Jean-Marc

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