Tuning for zero frame loss
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This document discusses tuning hardware and software for zero-frame loss when virtualizing network functions. It describes matching virtual network interface configurations in the hypervisor to the underlying hardware by adjusting queue sizes. A code snippet is provided to modify QEMU commands to set rx_queue_size and tx_queue_size for virtio-net-pci devices during VM instantiation. The goal is a perfect hardware-software match to eliminate dropped network frames.
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![#!/bin/bash
_TX_QUEUE_SIZE="tx_queue_size=1024"
_RX_QUEUE_SIZE="rx_queue_size=1024"
i=0
while [ $# -gt 0 ]
do
case "$1" in
-netdev|-device)
args[i]="$1"
(( i++ ))
shift
if [[ "$1" =~ "virtio-net-pci" ]]
then
args[i]=${1},${_RX_QUEUE_SIZE},{_TX_QUEUE_SIZE}
(( i++))
shift
fi
;;
*)
args[i]="$1"
(( i++ ))
shift ;;
esac
done
exec /usr/libexec/qemu-system-x86_64 "${args[@]}"](https://image.slidesharecdn.com/tuningforzero-frameloss-171123153002/85/Tuning-for-zero-frame-loss-18-320.jpg)
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Tuning for zero frame loss
- 1. TUNING FOR ZERO-FRAME LOSS A perfect match between hardware and software Federico Iezzi EMEA Telco Architect 23rd November 2017
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- 18. #!/bin/bash _TX_QUEUE_SIZE="tx_queue_size=1024" _RX_QUEUE_SIZE="rx_queue_size=1024" i=0 while [ $# -gt 0 ] do case "$1" in -netdev|-device) args[i]="$1" (( i++ )) shift if [[ "$1" =~ "virtio-net-pci" ]] then args[i]=${1},${_RX_QUEUE_SIZE},{_TX_QUEUE_SIZE} (( i++)) shift fi ;; *) args[i]="$1" (( i++ )) shift ;; esac done exec /usr/libexec/qemu-system-x86_64 "${args[@]}"
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