Allez, câdo, drop in /etc/network/if-up.d et chmod +x, et ifdown/ifup
une des cartes. Y'a sûrement mieux à faire, mais ça marche bien pour
moi. Le mieux que j'ai trouvé c'est 3 cartes réseaux intel 8 files en
LAG LACP pour 24 coeurs sur mon matériel. La regex est sûrement à
tuner.

#!/bin/bash

# This script balances the interrupts statically.

# It only touches the interrupts specified by this regular expressions
(grepped in /proc/interrupts)
# Only active interrupts will be grepped, so please re-run the script
on post-up.

NETWORK_INTERRUPTS=' (gbe|bnx|eth|igb)[0-9]+(-TxRx)?-[0-7]$'

# Balance the interrupts on all the cores, in round-robin fashion.
total_cores=$(cat /proc/cpuinfo | grep '^processor' | wc -l)
interrupts=$(cat /proc/interrupts | egrep "${NETWORK_INTERRUPTS}" |
awk -F: "{ print \$1 }" | tr '\n' ' ')

let current_core=0;
for irq in ${interrupts};
do
        affinity="$(printf "%08x" $((1 << ($current_core % $total_cores))))"
        # echo "IRQ #${irq} will have affinity to ${affinity}"
        echo "${affinity}" > "/proc/irq/${irq}/smp_affinity"
        let current_core=$(($current_core+1))
done

#!/bin/mksh
IFS=" "
set -A MAXCORE $(egrep -m1 "^cpu cores" /proc/cpuinfo)
MAXCORE="${MAXCORE[2]}"
c=0
l=0
IFS=$'\n'
while (( ++l < 100 )); do
    IFS=" "
    read -t2 -A || break
    if [[ "$l" = 1 ]]; then
        COLNUM="$((${#REPLY[*]}+2))"
    else
        if [[ "${REPLY[${COLNUM}]}" = @(gbe|bnx|eth|igb)+([0-9])* ]]; then
            printf "%08x" $((1 << ($c % ${MAXCORE}))) > /proc/irq/${REPLY[0]%:}/smp_affinity
            ((++c))
        fi
    fi
done < "/proc/interrupts"