2022-06-20 08:21:20 +00:00
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Mon, 20 Jun 2022 10:01:18 +0200
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Subject: [PATCH] net: disable GRO by default
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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In many cases GRO improves network performance however it comes at a
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cost of chacksums calculations. In case of slow CPU and missing hardware
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csum calculation support GRO can actually decrease network speed.
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On BCM4708 *disabling* GRO results in following NAT masquarade speed
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changes:
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1. 364 Mb/s → 396 Mb/s (packet steering disabled)
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2. 341 Mb/s → 566 Mb/s (packet steering enabled)
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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---
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include/linux/netdev_features.h | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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--- a/include/linux/netdev_features.h
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+++ b/include/linux/netdev_features.h
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2022-06-25 17:28:25 +00:00
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@@ -231,10 +231,10 @@ static inline int find_next_netdev_featu
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2022-06-20 08:21:20 +00:00
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#define NETIF_F_UPPER_DISABLES NETIF_F_LRO
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/* changeable features with no special hardware requirements */
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-#define NETIF_F_SOFT_FEATURES (NETIF_F_GSO | NETIF_F_GRO)
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+#define NETIF_F_SOFT_FEATURES (NETIF_F_GSO)
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/* Changeable features with no special hardware requirements that defaults to off. */
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-#define NETIF_F_SOFT_FEATURES_OFF NETIF_F_GRO_FRAGLIST
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+#define NETIF_F_SOFT_FEATURES_OFF (NETIF_F_GRO_FRAGLIST | NETIF_F_GRO)
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#define NETIF_F_VLAN_FEATURES (NETIF_F_HW_VLAN_CTAG_FILTER | \
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NETIF_F_HW_VLAN_CTAG_RX | \
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