Messages in this thread | | | Date | Tue, 5 Feb 2019 17:13:47 +0100 | From | Christoph Hellwig <> | Subject | Re: [PATCH] nvme: Enable acceleration feature of A64FX processor |
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On Tue, Feb 05, 2019 at 07:39:06AM -0700, Keith Busch wrote: > > Standard PCIe devices can use Relaxed Ordering (RO) by setting Attr > > field in the TLP header, however, this mechanism cannot be utilized if > > the device does not support RO feature. Fujitsu A64FX processor has an > > alternate feature to enable RO in its Root Port by setting the bit 56 of > > DMA address. This mechanism enables to utilize RO feature even if the > > device does not support standard PCIe RO. > > I think you're better of just purchasing devices that support the > capability per spec rather than with a non-standard work around.
Agreed, this seems like a pretty gross hack.
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