#!/bin/bash
#
# Copyright (c) 2014, Intel Corporation
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of Intel Corporation nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Affinitize interrupts to cores
#
# typical usage is (as root):
# set_irq_affinity -x local eth1 <eth2> <eth3>
#
# to get help:
# set_irq_affinity
usage()
{
echo
echo "Usage: $0 [-x] {all|local|remote|one|custom} [ethX] <[ethY]>"
echo " options: -x Configure XPS as well as smp_affinity"
echo " options: {remote|one} can be followed by a specific node number"
echo " Ex: $0 local eth0"
echo " Ex: $0 remote 1 eth0"
echo " Ex: $0 custom eth0 eth1"
echo " Ex: $0 0-7,16-23 eth0"
echo
exit 1
}
if [ "$1" == "-x" ]; then
XPS_ENA=1
shift
fi
num='^[0-9]+$'
# Vars
AFF=$1
shift
case "$AFF" in
remote) [[ $1 =~ $num ]] && rnode=$1 && shift ;;
one) [[ $1 =~ $num ]] && cnt=$1 && shift ;;
all) ;;
local) ;;
custom) ;;
[0-9]*) ;;
-h|--help) usage ;;
"") usage ;;
*) IFACES=$AFF && AFF=all ;; # Backwards compat mode
esac
# append the interfaces listed to the string with spaces
while [ "$#" -ne "0" ] ; do
IFACES+=" $1"
shift
done
# for now the user must specify interfaces
if [ -z "$IFACES" ]; then
usage
exit 1
fi
# support functions
set_affinity()
{
VEC=$core
if [ $VEC -ge 32 ]
then
MASK_FILL=""
MASK_ZERO="00000000"
let "IDX = $VEC / 32"
for ((i=1; i<=$IDX;i++))
do
MASK_FILL="${MASK_FILL},${MASK_ZERO}"
done
let "VEC -= 32 * $IDX"
MASK_TMP=$((1<<$VEC))
MASK=$(printf "%X%s" $MASK_TMP $MASK_FILL)
else
MASK_TMP=$((1<<$VEC))
MASK=$(printf "%X" $MASK_TMP)
fi
printf "%s" $MASK > /proc/irq/$IRQ/smp_affinity
printf "%s %d %s -> /proc/irq/$IRQ/smp_affinity\n" $IFACE $core $MASK
if ! [ -z "$XPS_ENA" ]; then
printf "%s %d %s -> /sys/class/net/%s/queues/tx-%d/xps_cpus\n" $IFACE $core $MASK $IFACE $((n-1))
printf "%s" $MASK > /sys/class/net/$IFACE/queues/tx-$((n-1))/xps_cpus
fi
}
# Allow usage of , or -
#
parse_range () {
RANGE=${@//,/ }
RANGE=${RANGE//-/..}
LIST=""
for r in $RANGE; do
# eval lets us use vars in {#..#} range
[[ $r =~ '..' ]] && r="$(eval echo {$r})"
LIST+=" $r"
done
echo $LIST
}
# Affinitize interrupts
#
setaff()
{
CORES=$(parse_range $CORES)
ncores=$(echo $CORES | wc -w)
n=1
# this script only supports interrupt vectors in pairs,
# modification would be required to support a single Tx or Rx queue
# per interrupt vector
queues="${IFACE}-.*TxRx"
irqs=$(grep "$queues" /proc/interrupts | cut -f1 -d:)
[ -z "$irqs" ] && irqs=$(grep $IFACE /proc/interrupts | cut -f1 -d:)
[ -z "$irqs" ] && irqs=$(for i in `ls -Ux /sys/class/net/$IFACE/device/msi_irqs` ;\
do grep "$i:.*TxRx" /proc/interrupts | grep -v fdir | cut -f 1 -d : ;\
done)
[ -z "$irqs" ] && echo "Error: Could not find interrupts for $IFACE"
echo "IFACE CORE MASK -> FILE"
echo "======================="
for IRQ in $irqs; do
[ "$n" -gt "$ncores" ] && n=1
j=1
# much faster than calling cut for each
for i in $CORES; do
[ $((j++)) -ge $n ] && break
done
core=$i
set_affinity
((n++))
done
}
# now the actual useful bits of code
# these next 2 lines would allow script to auto-determine interfaces
#[ -z "$IFACES" ] && IFACES=$(ls /sys/class/net)
#[ -z "$IFACES" ] && echo "Error: No interfaces up" && exit 1
# echo IFACES is $IFACES
CORES=$(</sys/devices/system/cpu/online)
[ "$CORES" ] || CORES=$(grep ^proc /proc/cpuinfo | cut -f2 -d:)
node_dir=/sys/devices/system/node
for i in $(ls -d $node_dir/node*);
do
i=${i/*node/}
corelist[$i]=$(<$node_dir/node${i}/cpulist)
done
for IFACE in $IFACES; do
dev_dir=/sys/class/net/$IFACE/device
[ -e $dev_dir/numa_node ] && node=$(<$dev_dir/numa_node)
[ "$node" ] && [ "$node" -gt 0 ] || node=0
case "$AFF" in
local)
CORES=${corelist[$node]}
;;
remote)
[ "$rnode" ] || { [ $node -eq 0 ] && rnode=1 || rnode=0; }
CORES=${corelist[$rnode]}
;;
one)
[ -n "$cnt" ] || cnt=0
CORES=$cnt
;;
all)
CORES=$CORES
;;
custom)
echo -n "Input cores for $IFACE (ex. 0-7,15-23): "
read CORES
;;
[0-9]*)
CORES=$AFF
;;
*)
usage
exit 1
;;
esac
# call the worker function
setaff
done
IRQBALANCE_ON=`ps ax | grep -v grep | grep -q irqbalance; echo $?`
if [ "$IRQBALANCE_ON" == "0" ] ; then
echo " WARNING: irqbalance is running and will"
echo " likely override this script's affinitization."
echo " Please stop the irqbalance service and/or execute"
echo " 'killall irqbalance'"
fi
