On 05/06/15 00:38, Jason Gunthorpe wrote:
Heck, on modern systems 100% of these requirements can be solved just
by using the IOMMU. No need for the HCA at all. (HCA may be more
performant, of course)
Hello Jason,
Any performance tests I have run so far with the IOMMU enabled show much
worse results than the same test with the IOMMU disabled. The perf tool
learned me that this performance difference is due to lock contention
caused by the IOMMU kernel code. I have not yet tried to verify whether
this is an implementation issue or something fundamental.
This is why I'm not enthusiast about any approach that relies on the
IOMMU being enabled.
Bart.
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