[PATCH] event/eth_tx: prefetch mbuf headers

[Stephen Hemminger]

On Fri, 28 Mar 2025 06:43:39 +0100
Mattias Rönnblom <mattias.ronnblom at ericsson.com> wrote:

> Prefetch mbuf headers, resulting in ~10% throughput improvement when
> the Ethernet RX and TX Adapters are hosted on the same core (likely
> ~2x in case a dedicated TX core is used).
> 
> Signed-off-by: Mattias Rönnblom <mattias.ronnblom at ericsson.com>
> Tested-by: Peter Nilsson <peter.j.nilsson at ericsson.com>

Prefetching all the mbufs can be counter productive on a big burst.

VPP does something similar but more unrolled.
See https://fd.io/docs/vpp/v2101/gettingstarted/developers/vnet.html#single-dual-loops