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- From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <[email protected]>
- Date: Mon, 20 Jun 2022 10:01:18 +0200
- Subject: [PATCH] net: disable GRO by default
- MIME-Version: 1.0
- Content-Type: text/plain; charset=UTF-8
- Content-Transfer-Encoding: 8bit
- In many cases GRO improves network performance however it comes at a
- cost of chacksums calculations. In case of slow CPU and missing hardware
- csum calculation support GRO can actually decrease network speed.
- On BCM4708 *disabling* GRO results in following NAT masquarade speed
- changes:
- 1. 364 Mb/s → 396 Mb/s (packet steering disabled)
- 2. 341 Mb/s → 566 Mb/s (packet steering enabled)
- Signed-off-by: Rafał Miłecki <[email protected]>
- ---
- include/linux/netdev_features.h | 4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
- --- a/include/linux/netdev_features.h
- +++ b/include/linux/netdev_features.h
- @@ -242,10 +242,10 @@ static inline int find_next_netdev_featu
- #define NETIF_F_UPPER_DISABLES NETIF_F_LRO
-
- /* changeable features with no special hardware requirements */
- -#define NETIF_F_SOFT_FEATURES (NETIF_F_GSO | NETIF_F_GRO)
- +#define NETIF_F_SOFT_FEATURES (NETIF_F_GSO)
-
- /* Changeable features with no special hardware requirements that defaults to off. */
- -#define NETIF_F_SOFT_FEATURES_OFF (NETIF_F_GRO_FRAGLIST | NETIF_F_GRO_UDP_FWD)
- +#define NETIF_F_SOFT_FEATURES_OFF (NETIF_F_GRO_FRAGLIST | NETIF_F_GRO_UDP_FWD | NETIF_F_GRO)
-
- #define NETIF_F_VLAN_FEATURES (NETIF_F_HW_VLAN_CTAG_FILTER | \
- NETIF_F_HW_VLAN_CTAG_RX | \
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