From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= 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 --- 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 @@ -243,10 +243,10 @@ 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 | NETIF_F_GRO_FRAGLIST) +#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_UDP_FWD) +#define NETIF_F_SOFT_FEATURES_OFF (NETIF_F_GRO_UDP_FWD | NETIF_F_GRO | NETIF_F_GRO_FRAGLIST) #define NETIF_F_VLAN_FEATURES (NETIF_F_HW_VLAN_CTAG_FILTER | \ NETIF_F_HW_VLAN_CTAG_RX | \