On Mon, Aug 18, 2025 at 6:56 AM Pavel Begunkov [off-list ref] wrote:

From: Jakub Kicinski <kuba@kernel.org>

Document the semantics of the rx_buf_len ethtool ring param.
Clarify its meaning in case of HDS, where driver may have
two separate buffer pools.

The various zero-copy TCP Rx schemes we have suffer from memory

nit: 'we have suffer' sounds weird, probably meant just 'suffer'.

management overhead. Specifically applications aren't too impressed
with the number of 4kB buffers they have to juggle. Zero-copy
TCP makes most sense with larger memory transfers so using
16kB or 32kB buffers (with the help of HW-GRO) feels more
natural.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>

Reviewed-by: Mina Almasry <redacted>

-- 
Thanks,
Mina