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authorRafał Miłecki <rafal@milecki.pl>2022-06-20 10:21:20 +0200
committerRafał Miłecki <rafal@milecki.pl>2022-07-08 13:02:39 +0200
commit5359a8ca382f473e2f671f6ed6f22e9d811c80cf (patch)
treed8cf2bf22e35638ea0455d8b2461e223162f5f86
parent027f7b18b9a738abbcae925367a1f653385bebe3 (diff)
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bcm53xx: disable GRO by default at kernel level
This improves NAT masquarade network performance. An alternative to kernel change would be runtime setup but that requires ethtool and identifying relevant network interface and all related switch ports interfaces. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> (cherry picked from commit 82d0dd8f8aa11249944fe39cd0d75a1524ec22ec)
-rw-r--r--target/linux/bcm53xx/patches-5.10/600-net-disable-GRO-by-default.patch36
1 files changed, 36 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-5.10/600-net-disable-GRO-by-default.patch b/target/linux/bcm53xx/patches-5.10/600-net-disable-GRO-by-default.patch
new file mode 100644
index 0000000000..506e6f5b99
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.10/600-net-disable-GRO-by-default.patch
@@ -0,0 +1,36 @@
+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
+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 <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
+@@ -231,10 +231,10 @@ static inline int find_next_netdev_feature(u64 feature, unsigned long start)
+ #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
++#define NETIF_F_SOFT_FEATURES_OFF (NETIF_F_GRO_FRAGLIST | NETIF_F_GRO)
+
+ #define NETIF_F_VLAN_FEATURES (NETIF_F_HW_VLAN_CTAG_FILTER | \
+ NETIF_F_HW_VLAN_CTAG_RX | \