Re: AF_XDP and dma

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On Fri, Apr 9, 2021 at 4:36 PM Magnus Karlsson
<magnus.karlsson@xxxxxxxxx> wrote:

> In XDP/AF_XDP mode, the NIC only uses a single 4K page (on x86-64) per
> packet so it will be physically contiguous by definition.
How ? if userspace allocates memory, it would be only contiguous in
virtual address space.
 >Every single
> page will be dma mapped separately and can reside anywhere.
I agree.  My concern is not on total memory. it is about each chunk.

>There is
> no scatter-gather in XDP/AF_XDP mode.
i agree.  i am not talking about Scatter gather (nr_frags or frag_list)

> > > > > > > /Magnus

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