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 ?