On Wed, Jun 14, 2017 at 05:40:30PM -0700, Ray Jui wrote:
> With the NVMf target test with 4 SSDs, fio based test, random read, 4k,
> 8 jobs:
>
> Without IOMMU:
>
> IOPS = 1080K
>
> With IOMMU, but without your latest patch:
>
> IOPS = 520K
>
> With IOMMU and your latest patch:
>
> IOPS = 500K ~ 850K (a lot of variation observed during the same test run)
That variation might come from the RB-Tree used in the IOVA allocator.
For block-device workloads the allocation size of iova ranges might be
bigger than what is cached in the magazines, so that the fall-back to
the old (locked) allocator is used.
Joerg
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