| From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> |
| Date: Mon, 20 Jun 2022 10:01:18 +0200 |
| Subject: [PATCH] net: disable GRO by default |
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| |
| 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 <rafal@milecki.pl> |
| --- |
| 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 |
| @@ -224,7 +224,7 @@ 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) |
| |
| #define NETIF_F_VLAN_FEATURES (NETIF_F_HW_VLAN_CTAG_FILTER | \ |
| NETIF_F_HW_VLAN_CTAG_RX | \ |