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authorRafał Miłecki <rafal@milecki.pl>2022-06-20 10:21:20 +0200
committerRafał Miłecki <rafal@milecki.pl>2022-07-08 16:18:25 +0200
commitc032ed3c267cae38be43991ce310883502c67f4b (patch)
tree0d28c29a7abd0d4d73896ce4b621d39701832343 /target/linux
parent4ec80cd907f25a056c1bca82d6ab722e59321eba (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)
Diffstat (limited to 'target/linux')
-rw-r--r--target/linux/bcm53xx/patches-5.4/600-net-disable-GRO-by-default.patch32
1 files changed, 32 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-5.4/600-net-disable-GRO-by-default.patch b/target/linux/bcm53xx/patches-5.4/600-net-disable-GRO-by-default.patch
new file mode 100644
index 0000000000..a11054e718
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.4/600-net-disable-GRO-by-default.patch
@@ -0,0 +1,32 @@
+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
+@@ -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 | \