[Skiboot] [PATCH 0/6] npu2: Add support for relaxed-ordering mode

Stewart Smith stewart at linux.ibm.com
Tue Aug 7 12:59:21 AEST 2018

Reza Arbab <arbab at linux.ibm.com> writes:
> We've only recently been given a suitable driver stack and hardware with which
> to test relaxed ordering, so I took the work Alistair had stashed away some
> time ago and fleshed it out.
> Patches 1-4 are very simple prep, but I thought the main patch was easier to
> read with them separated out.
> In light testing, GPUDirect throughput to an InfiniBand adapter increases ~3.6x
> when relaxed ordering is enabled.

I'm a little concerned about the state of relaxed ordering over kexec
boundary, and perhaps we should be resetting something? Or just leave it
up to the driver to ask for the right thing?

I don't think that's an explicit blocker though,
series merged to master as of 1c62f56b33511f4208ae289afb68f3d1f24f3924

Stewart Smith
OPAL Architect, IBM.

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