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SubjectRe: generic DMA bypass flag v4
On Wed,  8 Jul 2020 17:24:44 +0200
Christoph Hellwig <> wrote:

> Note that as-is this breaks the XSK buffer pool, which unfortunately
> poked directly into DMA internals. A fix for that is already queued
> up in the netdev tree.
> Jesper and XDP gang: this should not regress any performance as
> the dma-direct calls are now inlined into the out of line DMA mapping
> calls. But if you can verify the performance numbers that would be
> greatly appreciated.

From a superficial review of the patches, they look okay to me. I don't
have time to run a performance benchmark (before I go on vacation).

I hoped Björn could test/benchmark this(?), given (as mentioned) this
also affect XSK / AF_XDP performance.

Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat

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