* tedheadster <[email protected]> wrote:
> > 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.
Thanks for the update, I've re-applied this to tip:x86/urgent.
Ingo
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