> But you said without the fix it doesn't work at all? Or is this > the same box, just with the aic7xxx controller disabled? > > In general the patch should only have two effects: > > - set a small amount of memory aside for bounce buffering > - switch the default dma_ops from dma_direct_ops to swiotlb_ops > > I can't really see how either could have such a huge effect, even with > swiotlb having a couple more wired up ops for which we'd enable spectre > mitigations. > > So a strict before and after would be very interesting, if it is really > just this one change that causes such a huge drop we have hidden dragons > somewhere..
Christoph, I did a very controlled before-and-after and got very sensible results. All compiles were close in time with patched and un-patched kernels. I must have screwed something up with my last round of testing. Ingo: I am confident this patch should be accepted. - Matthew Whitehead _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
