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#!/bin/sh
[ "$ACTION" = add ] || exit
NPROCS="$(grep -c "^processor.*:" /proc/cpuinfo)"
[ "$NPROCS" -gt 1 ] || exit
PROC_MASK="$(( (1 << $NPROCS) - 1 ))"
find_irq_cpu() {
local dev="$1"
local match="$(grep -m 1 "$dev\$" /proc/interrupts)"
local cpu=0
[ -n "$match" ] && {
set -- $match
shift
for cur in `seq 1 $NPROCS`; do
[ "$1" -gt 0 ] && {
cpu=$(($cur - 1))
break
}
shift
done
}
echo "$cpu"
}
set_hex_val() {
local file="$1"
local val="$2"
val="$(printf %x "$val")"
[ -n "$DEBUG" ] && echo "$file = $val"
echo "$val" > "$file"
}
default_ps="$(uci get "network.@globals[0].default_ps")"
[ -n "$default_ps" -a "$default_ps" != 1 ] && exit 0
exec 512>/var/lock/smp_tune.lock
flock 512 || exit 1
for dev in /sys/class/net/*; do
[ -d "$dev" ] || continue
# ignore virtual interfaces
[ -n "$(ls "${dev}/" | grep '^lower_')" ] && continue
[ -d "${dev}/device" ] || continue
device="$(readlink "${dev}/device")"
device="$(basename "$device")"
irq_cpu="$(find_irq_cpu "$device")"
irq_cpu_mask="$((1 << $irq_cpu))"
for q in ${dev}/queues/rx-*; do
set_hex_val "$q/rps_cpus" "$(($PROC_MASK & ~$irq_cpu_mask))"
done
ntxq="$(ls -d ${dev}/queues/tx-* | wc -l)"
idx=$(($irq_cpu + 1))
for q in ${dev}/queues/tx-*; do
set_hex_val "$q/xps_cpus" "$((1 << $idx))"
let "idx = idx + 1"
[ "$idx" -ge "$NPROCS" ] && idx=0
done
done
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