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authorRafał Miłecki <rafal@milecki.pl>2022-06-10 10:51:23 +0200
committerRafał Miłecki <rafal@milecki.pl>2022-07-08 16:18:25 +0200
commita50f5b3fb2024fe00f726dff2093a83410bd3c8d (patch)
treeccdd7cf6f956bd1e41893c59cb04831345ceae6e
parentc032ed3c267cae38be43991ce310883502c67f4b (diff)
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bcm53xx: enable & setup packet steering
Packet steering can improve NAT masquarade performance on Northstar by 40-50%. It makes reaching 940-942 Mb/s possible on BCM4708 (and obviously BCM47094 too). Add scripts setting up the most optimal Northstar setup. Below are testing results for running iperf TCP traffic from LAN to WAN. They were used to pick up golden values. ┌──────────┬──────────┬────────────────────┬────────────────────┐ │ eth0 │ br-lan │ flow_offloading=0 │ flow_offloading=1 │ │ │ ├─────────┬──────────┼─────────┬──────────┤ │ rps_cpus │ rps_cpus │ BCM4708 │ BCM47094 │ BCM4708 │ BCM47094 │ ├──────────┼──────────┼─────────┼──────────┼─────────┼──────────┤ │ 0 │ 0 │ 387 │ 671 │ 707 │ 941 │ │ 0 │ 1 │ 343 │ 576 │ 705 │ 941 │ │ 0 │ 2 │ ✓ 574 │ ✓ 941 │ 704 │ 940 │ │ 1 │ 0 │ 320 │ 549 │ 561 │ 941 │ │ 1 │ 1 │ 327 │ 551 │ 553 │ 941 │ │ 1 │ 2 │ 523 │ ✓ 940 │ 559 │ 940 │ │ 2 │ 0 │ 383 │ 652 │ ✓ 940 │ 941 │ │ 2 │ 1 │ 448 │ 754 │ ✓ 942 │ 941 │ │ 2 │ 2 │ 404 │ 655 │ ✓ 941 │ 941 │ └──────────┴──────────┴─────────┴──────────┴─────────┴──────────┘ Above tests were performed with all eth0 interrupts handled by CPU0. Setting "echo 2 > /proc/irq/38/smp_affinity" was tested on BCM4708 but it didn't increased speeds (just required different steering): ┌──────────┬──────────┬───────────┐ │ eth0 │ br-lan │ flow_offl │ │ rx-0 │ rx-0 │ oading=0 │ │ rps_cpus │ rps_cpus │ BCM4708 │ ├──────────┼──────────┼───────────┤ │ 0 │ 0 │ 384 │ │ 0 │ 1 │ ✓ 574 │ │ 0 │ 2 │ 348 │ │ 1 │ 0 │ 383 │ │ 1 │ 1 │ 412 │ │ 1 │ 2 │ 448 │ │ 2 │ 0 │ 321 │ │ 2 │ 1 │ 520 │ │ 2 │ 2 │ 327 │ └──────────┴──────────┴───────────┘ Signed-off-by: Rafał Miłecki <rafal@milecki.pl> (cherry picked from commit fcbd39689ebfef20c62fe3882d51f3af765e8028)
-rwxr-xr-xtarget/linux/bcm53xx/base-files/etc/init.d/fastnetwork44
-rw-r--r--target/linux/bcm53xx/base-files/etc/uci-defaults/05_packet_steering3
2 files changed, 47 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/base-files/etc/init.d/fastnetwork b/target/linux/bcm53xx/base-files/etc/init.d/fastnetwork
new file mode 100755
index 0000000000..1999d13707
--- /dev/null
+++ b/target/linux/bcm53xx/base-files/etc/init.d/fastnetwork
@@ -0,0 +1,44 @@
+#!/bin/sh /etc/rc.common
+
+START=25
+USE_PROCD=1
+
+start_service() {
+ reload_service
+}
+
+service_triggers() {
+ procd_add_reload_trigger "network"
+ procd_add_reload_trigger "firewall"
+ procd_add_reload_interface_trigger "lan"
+}
+
+reload_service() {
+ local packet_steering="$(uci -q get network.@globals[0].packet_steering)"
+ local num_cpus="$(grep -c "^processor.*:" /proc/cpuinfo)"
+ local flow_offloading="$(uci -q get firewall.@defaults[0].flow_offloading)"
+ local flow_offloading_hw="$(uci -q get firewall.@defaults[0].flow_offloading_hw)"
+
+ # Any steering on 1 CPU (BCM47081) worsens network performance
+ [ "$num_cpus" != 2 ] && return
+
+ [ "$packet_steering" != 1 ] && {
+ echo 0 > /sys/class/net/br-lan/queues/rx-0/rps_cpus
+ echo 0 > /sys/class/net/eth0/queues/rx-0/rps_cpus
+ return
+ }
+
+ if [ ${flow_offloading_hw:-0} -gt 0 ]; then
+ # HW offloading
+ echo 0 > /sys/class/net/br-lan/queues/rx-0/rps_cpus
+ echo 0 > /sys/class/net/eth0/queues/rx-0/rps_cpus
+ elif [ ${flow_offloading:-0} -gt 0 ]; then
+ # SW offloading
+ # br-lan setup doesn't seem to matter for offloading case
+ echo 2 > /sys/class/net/eth0/queues/rx-0/rps_cpus
+ else
+ # Default
+ echo 2 > /sys/class/net/br-lan/queues/rx-0/rps_cpus
+ echo 0 > /sys/class/net/eth0/queues/rx-0/rps_cpus
+ fi
+}
diff --git a/target/linux/bcm53xx/base-files/etc/uci-defaults/05_packet_steering b/target/linux/bcm53xx/base-files/etc/uci-defaults/05_packet_steering
new file mode 100644
index 0000000000..98c9497815
--- /dev/null
+++ b/target/linux/bcm53xx/base-files/etc/uci-defaults/05_packet_steering
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+uci set network.@globals[0].packet_steering="1"