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    CPU网卡亲和绑定

    #!/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
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