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udhayakumar-in8/set_irq_affinity.sh

Forked from xdel/set_irq_affinity.sh
Created July 17, 2023 16:56
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  1. @xdel xdel renamed this gist Dec 31, 2017. 1 changed file with 0 additions and 0 deletions.
    0 setirqaff.sh → set_irq_affinity.sh
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  2. @xdel xdel created this gist Dec 21, 2017.
    87 changes: 87 additions & 0 deletions setirqaff.sh
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    Original file line number Diff line number Diff line change
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    # setting up irq affinity according to /proc/interrupts
    # 2008-11-25 Robert Olsson
    # 2009-02-19 updated by Jesse Brandeburg
    # 2012-12-21 fix for systems with >32 cores by Andrey K.
    #
    # > Dave Miller:
    # (To get consistent naming in /proc/interrups)
    # I would suggest that people use something like:
    #char buf[IFNAMSIZ+6];
    #
    #sprintf(buf, "%s-%s-%d",
    #netdev->name,
    #(RX_INTERRUPT ? "rx" : "tx"),
    #queue->index);
    #
    # Assuming a device with two RX and TX queues.
    # This script will assign:
    #
    #eth0-rx-0 CPU0
    #eth0-rx-1 CPU1
    #eth0-tx-0 CPU0
    #eth0-tx-1 CPU1
    #

    set_affinity()
    {
    MASK=$((1<<$VEC))
    local CONCAT_MASK=$(printf "%X" $MASK)
    if [ ${#CONCAT_MASK} -gt 8 ]; then
    CONCAT_MASK=$(echo $CONCAT_MASK | rev | sed 's/.\{8\}/&,/g' | rev)
    fi
    echo "$DEV mask=$CONCAT_MASK for /proc/irq/$IRQ/smp_affinity"
    echo $CONCAT_MASK > /proc/irq/$IRQ/smp_affinity
    #printf "%X" $MASK > /proc/irq/$IRQ/smp_affinity
    #echo $DEV mask=$MASK for /proc/irq/$IRQ/smp_affinity
    #echo $MASK > /proc/irq/$IRQ/smp_affinity
    }

    if [ "$1" = "" ] ; then
    echo "Description:"
    echo " This script attempts to bind each queue of a multi-queue NIC"
    echo " to the same numbered core, ie tx0|rx0 --> cpu0, tx1|rx1 --> cpu1"
    echo "usage:"
    echo " $0 eth0 [eth1 eth2 eth3]"
    fi


    # check for irqbalance running
    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

    #
    # Set up the desired devices.
    #

    for DEV in $*
    do
    for DIR in rx tx TxRx
    do
    MAX=`grep $DEV-$DIR /proc/interrupts | wc -l`
    if [ "$MAX" == "0" ] ; then
    MAX=`egrep -i "$DEV:.*$DIR" /proc/interrupts | wc -l`
    fi
    if [ "$MAX" == "0" ] ; then
    echo no $DIR vectors found on $DEV
    continue
    #exit 1
    fi
    for VEC in `seq 0 1 $MAX`
    do
    IRQ=`cat /proc/interrupts | grep -i $DEV-$DIR-$VEC"$" | cut -d: -f1 | sed "s/ //g"`
    if [ -n "$IRQ" ]; then
    set_affinity
    else
    IRQ=`cat /proc/interrupts | egrep -i $DEV:v$VEC-$DIR"$" | cut -d: -f1 | sed "s/ //g"`
    if [ -n "$IRQ" ]; then
    set_affinity
    fi
    fi
    done
    done
    done