eth: bnxt: disable rx-copybreak by default

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rx-copybreak requires an extra slab allocation. Since bnxt uses
page pool frags and HDS by default, the rx-copybreak doesn't
buy us anything. The extra pressure on slab causes overload
on pre-sheaves kernels on modern AMD platforms.

In synthetic testing on net-next this patch shows little difference
but I think copybreak is "obvious waste" at this point.

Default rx-copybreak threshold to 0 / disabled.

The "copybreak" defines are really the size bounds for the Rx header
buffer. Rename them.

Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Link: https://patch.msgid.link/20260602003759.1545645-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Jakub Kicinski 2026-06-01 17:37:59 -07:00

parent ee5aee77bc

commit bd3beb5c86

3 changed files with 7 additions and 7 deletions

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6

drivers/net/ethernet/broadcom/bnxt/bnxt.c

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4

drivers/net/ethernet/broadcom/bnxt/bnxt.h

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4

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

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