On 17/09/2018 12:20, John Garry wrote:
On 14/09/2018 13:48, Will Deacon wrote:
Hi Robin,
Hi Robin,
I just spoke with Dongdong and we will test this version also so that we
may provide a "Tested-by" tag.
I tested this, so for series:
Tested-by: John Garry <john.ga...@huawei.com>
Thanks,
John
Thanks,
John
On Wed, Sep 12, 2018 at 04:24:11PM +0100, Robin Murphy wrote:
John raised the issue[1] that we have some unnecessary refcount
contention
in the DMA ops path which shows scalability problems now that we have
more
real high-performance hardware using iommu-dma. The x86 IOMMU drivers
are
sidestepping this by stashing domain references in archdata, but since
that's not very nice for architecture-agnostic code, I think it's
time to
look at a generic API-level solution.
These are a couple of quick patches based on the idea I had back when
first implementing iommu-dma, but didn't have any way to justify at the
time. However, the reports of 10-25% better networking performance on v1
suggest that it's very worthwhile (and far more significant than I ever
would have guessed).
As far as merging goes, I don't mind at all whether this goes via IOMMU,
or via dma-mapping provided Joerg's happy to ack it.
I think it makes most sense for Joerg to take this series via his tree.
Anyway, I've been running them on my TX2 box and things are happy enough,
so:
Tested-by: Will Deacon <will.dea...@arm.com>
Will
.
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