​Low Latency

• ​​Turn hyper-threading (logical cores) off.
• ​​Turn irqbalance off. systemctl stop irqbalance

  or, to make the change permanent:

  systemctl disable irqbalance
• ​​To enable busy poll. sysctl -w net.core.busy_poll=50 sysctl -w net.core.busy_read=50
• ​Limit number of queues to be equal to the number of cores on the local socket (32 in this example). ethtool -L ethX combined 32
• ​​Pin interrupts to local socket only (script packaged with ice driver source). set_irq_affinity -X local ethX
• ​​Enable symmetric queuing to align Tx/Rx queues (script packaged with ice driver source). set_xps_rxqs ethX
• ​​Turn off interrupt moderation. ethtool -C ethX adaptive-rx off adaptive-tx off rx-usecs 0 tx-usecs 0

• ​​Use an established benchmark like: netperf -t TCP_RR

  or

  netperf -t UDP_RR
• ​​Pin benchmark to a single core in the local NUMA node. taskset -c <cpu>