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Add the pktgen samples script pktgen_sample03_burst_single_flow.sh
that demonstrates how to acheive maximum performance.
If correctly tuned[1] single CPU 10Gbit/s wirespeed small pkts is
possible[2] which is 14.88Mpps. The trick is to take advantage of the
"burst" feature introduced in commit 38b2cf2982 ("net: pktgen:
packet bursting via skb->xmit_more").
[1] http://netoptimizer.blogspot.dk/2014/06/pktgen-for-network-overload-testing.html
[2] http://netoptimizer.blogspot.dk/2014/10/unlocked-10gbps-tx-wirespeed-smallest.html
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
83 lines
2.5 KiB
Bash
Executable File
83 lines
2.5 KiB
Bash
Executable File
#!/bin/bash
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#
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# Script for max single flow performance
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# - If correctly tuned[1], single CPU 10G wirespeed small pkts is possible[2]
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#
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# Using pktgen "burst" option (use -b $N)
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# - To boost max performance
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# - Avail since: kernel v3.18
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# * commit 38b2cf2982dc73 ("net: pktgen: packet bursting via skb->xmit_more")
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# - This avoids writing the HW tailptr on every driver xmit
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# - The performance boost is impressive, see commit and blog [2]
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#
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# Notice: On purpose generates a single (UDP) flow towards target,
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# reason behind this is to only overload/activate a single CPU on
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# target host. And no randomness for pktgen also makes it faster.
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#
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# Tuning see:
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# [1] http://netoptimizer.blogspot.dk/2014/06/pktgen-for-network-overload-testing.html
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# [2] http://netoptimizer.blogspot.dk/2014/10/unlocked-10gbps-tx-wirespeed-smallest.html
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#
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basedir=`dirname $0`
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source ${basedir}/functions.sh
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root_check_run_with_sudo "$@"
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# Parameter parsing via include
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source ${basedir}/parameters.sh
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# Set some default params, if they didn't get set
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[ -z "$DEST_IP" ] && DEST_IP="198.18.0.42"
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[ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"
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[ -z "$BURST" ] && BURST=32
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[ -z "$CLONE_SKB" ] && CLONE_SKB="100000"
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# Base Config
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DELAY="0" # Zero means max speed
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COUNT="0" # Zero means indefinitely
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# General cleanup everything since last run
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pg_ctrl "reset"
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# Threads are specified with parameter -t value in $THREADS
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for ((thread = 0; thread < $THREADS; thread++)); do
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dev=${DEV}@${thread}
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# Add remove all other devices and add_device $dev to thread
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pg_thread $thread "rem_device_all"
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pg_thread $thread "add_device" $dev
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# Base config
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pg_set $dev "flag QUEUE_MAP_CPU"
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pg_set $dev "count $COUNT"
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pg_set $dev "clone_skb $CLONE_SKB"
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pg_set $dev "pkt_size $PKT_SIZE"
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pg_set $dev "delay $DELAY"
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pg_set $dev "flag NO_TIMESTAMP"
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# Destination
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pg_set $dev "dst_mac $DST_MAC"
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pg_set $dev "dst $DEST_IP"
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# Setup burst, for easy testing -b 0 disable bursting
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# (internally in pktgen default and minimum burst=1)
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if [[ ${BURST} -ne 0 ]]; then
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pg_set $dev "burst $BURST"
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else
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info "$dev: Not using burst"
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fi
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done
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# Run if user hits control-c
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function control_c() {
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# Print results
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for ((thread = 0; thread < $THREADS; thread++)); do
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dev=${DEV}@${thread}
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echo "Device: $dev"
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cat /proc/net/pktgen/$dev | grep -A2 "Result:"
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done
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}
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# trap keyboard interrupt (Ctrl-C)
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trap control_c SIGINT
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echo "Running... ctrl^C to stop" >&2
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pg_ctrl "start"
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