2018-04-11 20:35 GMT+02:00 Jean-Marc Valin <jmva...@mozilla.com>:
> 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.

To get that right .. is only a matter of disabling SWIOTLB *code*
while CONFIG_SWIOTLB is still set ?

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