Re: intel iommu causing performance drop in mlx4 ipoib

Or Gerlitz
2016-05-16T12:05:10Z

On Mon, May 16, 2016 at 1:39 PM, Nikolay Borisov <kernel-6AxghH7DbtA@public.gmane.org> wrote:
[...]
> Essentially the majority is spent in just receiving the packets and the
> sustained rate is 26Gbps. So the question why does compiling in (but not
> enabling intel_iommu=on kills performance) only on the receive side, e.g. if

add iommu=pt to your boot, this is 2009 material [1]

Or.

[1] https://lwn.net/Articles/329174/