I don't know if this affects AF_XDP as well, but XDP does not support jumbo frames at all: https://prototype-kernel.readthedocs.io/en/latest/networking/XDP/design/requirements.html#page-per-packet On my test box running 4.18 if XDP is in use the MTU can not be set higher than 3050. On Mon, Sep 24, 2018 at 4:53 PM Alex Forster <aforster@xxxxxxxxxxxxxx> wrote: > > What happens in the case where umem's chunk size is smaller than the > NIC frame size, like when jumbo frames are enabled? I.e, a NIC using > MTU ~9000 on an x86-64 machine with a page size of 4096. > > Alex Forster -- - Justin
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