Re: intel iommu causing performance drop in mlx4 ipoib

David Woodhouse
2016-05-16T12:39:41Z

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On Mon, 2016-05-16 at 15:37 +0300, Nikolay Borisov wrote:
>
> Oops, turned out I had intel_iommu=on, though I'm sure some days ago I
> didn't and performance suffered. I now tried with this option removed
> and performance is again back to normal. All in all this driver +
> intel_iommu is a bad combination I guess. Anyway, sorry for the noise
> and thanks for the prompt reply.

I would be very interested to see your results with the latest code
from git://git.infradead.org/intel-iommu.git (and with the IOMMU still
enabled).

--
David Woodhouse Open Source Technology Centre
David.Woodhouse-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org Intel Corporation

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