achieve lowlatency

lowlatency

#!/bin/bash

#
# achieve lowlatency
#

flow_entries=32768
intf=eth0
core=$(cat /proc/cpuinfo | grep -c processor)
rxn=$(ls /sys/class/net/$intf/queues/ | grep rx | wc -l)

# no need to enable rps/rfs
if [[ $rxn > 1 ]]; then
  exit 1
fi

# disable irqbalance
if ps aux | grep irqbalance | grep -v grep; then
    killall irqbalance > /dev/null 2>&1
fi

# enable rfs
echo $flow_entries > /proc/sys/net/core/rps_sock_flow_entries

queue=0
while [[ $queue < $rxn ]]
do
  # enable rps
  printf "%x\n" $((2**core-1)) > /sys/class/net/$intf/queues/rx-$queue/rps_cpus

  echo $((flow_entries/rxn)) > /sys/class/net/$intf/queues/rx-$queue/rps_flow_cnt
  ((queue++))
done

exit 0