99 lines
1.9 KiB
Bash
99 lines
1.9 KiB
Bash
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# SPDX-License-Identifier: GPL-2.0
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humanize()
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{
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local speed=$1; shift
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for unit in bps Kbps Mbps Gbps; do
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if (($(echo "$speed < 1024" | bc))); then
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break
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fi
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speed=$(echo "scale=1; $speed / 1024" | bc)
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done
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echo "$speed${unit}"
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}
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rate()
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{
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local t0=$1; shift
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local t1=$1; shift
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local interval=$1; shift
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echo $((8 * (t1 - t0) / interval))
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}
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start_traffic()
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{
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local h_in=$1; shift # Where the traffic egresses the host
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local sip=$1; shift
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local dip=$1; shift
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local dmac=$1; shift
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$MZ $h_in -p 8000 -A $sip -B $dip -c 0 \
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-a own -b $dmac -t udp -q &
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sleep 1
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}
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stop_traffic()
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{
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# Suppress noise from killing mausezahn.
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{ kill %% && wait %%; } 2>/dev/null
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}
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check_rate()
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{
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local rate=$1; shift
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local min=$1; shift
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local what=$1; shift
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if ((rate > min)); then
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return 0
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fi
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echo "$what $(humanize $ir) < $(humanize $min)" > /dev/stderr
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return 1
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}
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measure_rate()
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{
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local sw_in=$1; shift # Where the traffic ingresses the switch
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local host_in=$1; shift # Where it ingresses another host
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local counter=$1; shift # Counter to use for measurement
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local what=$1; shift
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local interval=10
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local i
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local ret=0
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# Dips in performance might cause momentary ingress rate to drop below
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# 1Gbps. That wouldn't saturate egress and MC would thus get through,
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# seemingly winning bandwidth on account of UC. Demand at least 2Gbps
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# average ingress rate to somewhat mitigate this.
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local min_ingress=2147483648
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for i in {5..0}; do
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local t0=$(ethtool_stats_get $host_in $counter)
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local u0=$(ethtool_stats_get $sw_in $counter)
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sleep $interval
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local t1=$(ethtool_stats_get $host_in $counter)
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local u1=$(ethtool_stats_get $sw_in $counter)
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local ir=$(rate $u0 $u1 $interval)
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local er=$(rate $t0 $t1 $interval)
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if check_rate $ir $min_ingress "$what ingress rate"; then
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break
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fi
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# Fail the test if we can't get the throughput.
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if ((i == 0)); then
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ret=1
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fi
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done
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echo $ir $er
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return $ret
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}
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