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bpf: HBM test script

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Script for testing HBM (Host Bandwidth Manager) framework.
It creates a cgroup to use for testing and load a BPF program to limit
egress bandwidht. It then uses iperf3 or netperf to create
loads. The output is the goodput in Mbps (unless -D is used).

It can work on a single host using loopback or among two hosts (with netperf).
When using loopback, it is recommended to also introduce a delay of at least
1ms (-d=1), otherwise the assigned bandwidth is likely to be underutilized.

USAGE: $name [out] [-b=<prog>|--bpf=<prog>] [-c=<cc>|--cc=<cc>] [-D]
             [-d=<delay>|--delay=<delay>] [--debug] [-E]
             [-f=<#flows>|--flows=<#flows>] [-h] [-i=<id>|--id=<id >] [-l]
	     [-N] [-p=<port>|--port=<port>] [-P] [-q=<qdisc>]
             [-R] [-s=<server>|--server=<server] [--stats]
	     [-t=<time>|--time=<time>] [-w] [cubic|dctcp]
  Where:
    out               Egress (default egress)
    -b or --bpf       BPF program filename to load and attach.
                      Default is nrm_out_kern.o for egress,
    -c or -cc         TCP congestion control (cubic or dctcp)
    -d or --delay     Add a delay in ms using netem
    -D                In addition to the goodput in Mbps, it also outputs
                      other detailed information. This information is
                      test dependent (i.e. iperf3 or netperf).
    --debug           Print BPF trace buffer
    -E                Enable ECN (not required for dctcp)
    -f or --flows     Number of concurrent flows (default=1)
    -i or --id        cgroup id (an integer, default is 1)
    -l                Do not limit flows using loopback
    -N                Use netperf instead of iperf3
    -h                Help
    -p or --port      iperf3 port (default is 5201)
    -P                Use an iperf3 instance for each flow
    -q                Use the specified qdisc.
    -r or --rate      Rate in Mbps (default 1s 1Gbps)
    -R                Use TCP_RR for netperf. 1st flow has req
                      size of 10KB, rest of 1MB. Reply in all
                      cases is 1 byte.
                      More detailed output for each flow can be found
                      in the files netperf.<cg>.<flow>, where <cg> is the
                      cgroup id as specified with the -i flag, and <flow>
                      is the flow id starting at 1 and increasing by 1 for
                      flow (as specified by -f).
    -s or --server    hostname of netperf server. Used to create netperf
                      test traffic between to hosts (default is within host)
                      netserver must be running on the host.
    --stats           Get HBM stats (marked, dropped, etc.)
    -t or --time      duration of iperf3 in seconds (default=5)
    -w                Work conserving flag. cgroup can increase its
                      bandwidth beyond the rate limit specified
                      while there is available bandwidth. Current
                      implementation assumes there is only one NIC
                      (eth0), but can be extended to support multiple
                      NICs. This is just a proof of concept.
    cubic or dctcp    specify TCP CC to use

Examples:
 ./do_hbm_test.sh -l -d=1 -D --stats
     Runs a 5 second test, using a single iperf3 flow and with the default
     rate limit of 1Gbps and a delay of 1ms (using netem) using the default
     TCP congestion control on the loopback device (hence we use "-l" to
     enforce bandwidth limit on loopback device). Since no direction is
     specified, it defaults to egress. Since no TCP CC algorithm is
     specified it uses the system default (Cubic for this test).
     With no -D flag, only the value of the AGGREGATE OUTPUT would show.
     id refers to the cgroup id and is useful when running multi cgroup
     tests (supported by a future patch).
     This patchset does not support calling TCP's congesion window
     reduction, even when packets are dropped by the BPF program, resulting
     in a large number of packets dropped. It is recommended that the  current
     HBM implemenation only be used with ECN enabled flows. A future patch
     will add support for reducing TCP's cwnd and will increase the
     performance of non-ECN enabled flows.
   Output:
     Details for HBM in cgroup 1
     id:1
     rate_mbps:493
     duration:4.8 secs
     packets:11355
     bytes_MB:590
     pkts_dropped:4497
     bytes_dropped_MB:292
     pkts_marked_percent: 39.60
     bytes_marked_percent: 49.49
     pkts_dropped_percent: 39.60
     bytes_dropped_percent: 49.49
     PING AVG DELAY:2.075
     AGGREGATE_GOODPUT:505

./do_nrm_test.sh -l -d=1 -D --stats dctcp
     Same as above but using dctcp. Note that fewer bytes are dropped
     (0.01% vs. 49%).
   Output:
     Details for HBM in cgroup 1
     id:1
     rate_mbps:945
     duration:4.9 secs
     packets:16859
     bytes_MB:578
     pkts_dropped:1
     bytes_dropped_MB:0
     pkts_marked_percent: 28.74
     bytes_marked_percent: 45.15
     pkts_dropped_percent:  0.01
     bytes_dropped_percent:  0.01
     PING AVG DELAY:2.083
     AGGREGATE_GOODPUT:965

./do_nrm_test.sh -d=1 -D --stats
     As first example, but without limiting loopback device (i.e. no
     "-l" flag). Since there is no bandwidth limiting, no details for
     HBM are printed out.
   Output:
     Details for HBM in cgroup 1
     PING AVG DELAY:2.019
     AGGREGATE_GOODPUT:42655

./do_hbm.sh -l -d=1 -D --stats -f=2
     Uses iper3 and does 2 flows
./do_hbm.sh -l -d=1 -D --stats -f=4 -P
     Uses iperf3 and does 4 flows, each flow as a separate process.
./do_hbm.sh -l -d=1 -D --stats -f=4 -N
     Uses netperf, 4 flows
./do_hbm.sh -f=1 -r=2000 -t=5 -N -D --stats dctcp -s=<server-name>
     Uses netperf between two hosts. The remote host name is specified
     with -s= and you need to start the program netserver manually on
     the remote host. It will use 1 flow, a rate limit of 2Gbps and dctcp.
./do_hbm.sh -f=1 -r=2000 -t=5 -N -D --stats -w dctcp \
     -s=<server-name>
     As previous, but allows use of extra bandwidth. For this test the
     rate is 8Gbps vs. 1Gbps of the previous test.

Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
brakmo 2019-03-01 12:38:50 -08:00 committed by Alexei Starovoitov
parent a1270fe95b
commit 4ffd44cfd1
1 changed files with 436 additions and 0 deletions
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samples/bpf/do_hbm_test.sh Executable file
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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (c) 2019 Facebook
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License as published by the Free Software Foundation.
Usage() {
echo "Script for testing HBM (Host Bandwidth Manager) framework."
echo "It creates a cgroup to use for testing and load a BPF program to limit"
echo "egress or ingress bandwidht. It then uses iperf3 or netperf to create"
echo "loads. The output is the goodput in Mbps (unless -D was used)."
echo ""
echo "USAGE: $name [out] [-b=<prog>|--bpf=<prog>] [-c=<cc>|--cc=<cc>] [-D]"
echo " [-d=<delay>|--delay=<delay>] [--debug] [-E]"
echo " [-f=<#flows>|--flows=<#flows>] [-h] [-i=<id>|--id=<id >]"
echo " [-l] [-N] [-p=<port>|--port=<port>] [-P]"
echo " [-q=<qdisc>] [-R] [-s=<server>|--server=<server]"
echo " [-S|--stats] -t=<time>|--time=<time>] [-w] [cubic|dctcp]"
echo " Where:"
echo " out egress (default)"
echo " -b or --bpf BPF program filename to load and attach."
echo " Default is hbm_out_kern.o for egress,"
echo " -c or -cc TCP congestion control (cubic or dctcp)"
echo " --debug print BPF trace buffer"
echo " -d or --delay add a delay in ms using netem"
echo " -D In addition to the goodput in Mbps, it also outputs"
echo " other detailed information. This information is"
echo " test dependent (i.e. iperf3 or netperf)."
echo " -E enable ECN (not required for dctcp)"
echo " -f or --flows number of concurrent flows (default=1)"
echo " -i or --id cgroup id (an integer, default is 1)"
echo " -N use netperf instead of iperf3"
echo " -l do not limit flows using loopback"
echo " -h Help"
echo " -p or --port iperf3 port (default is 5201)"
echo " -P use an iperf3 instance for each flow"
echo " -q use the specified qdisc"
echo " -r or --rate rate in Mbps (default 1s 1Gbps)"
echo " -R Use TCP_RR for netperf. 1st flow has req"
echo " size of 10KB, rest of 1MB. Reply in all"
echo " cases is 1 byte."
echo " More detailed output for each flow can be found"
echo " in the files netperf.<cg>.<flow>, where <cg> is the"
echo " cgroup id as specified with the -i flag, and <flow>"
echo " is the flow id starting at 1 and increasing by 1 for"
echo " flow (as specified by -f)."
echo " -s or --server hostname of netperf server. Used to create netperf"
echo " test traffic between to hosts (default is within host)"
echo " netserver must be running on the host."
echo " -S or --stats whether to update hbm stats (default is yes)."
echo " -t or --time duration of iperf3 in seconds (default=5)"
echo " -w Work conserving flag. cgroup can increase its"
echo " bandwidth beyond the rate limit specified"
echo " while there is available bandwidth. Current"
echo " implementation assumes there is only one NIC"
echo " (eth0), but can be extended to support multiple"
echo " NICs."
echo " cubic or dctcp specify which TCP CC to use"
echo " "
exit
}
#set -x
debug_flag=0
args="$@"
name="$0"
netem=0
cc=x
dir="-o"
dir_name="out"
dur=5
flows=1
id=1
prog=""
port=5201
rate=1000
multi_iperf=0
flow_cnt=1
use_netperf=0
rr=0
ecn=0
details=0
server=""
qdisc=""
flags=""
do_stats=0
function start_hbm () {
rm -f hbm.out
echo "./hbm $dir -n $id -r $rate -t $dur $flags $dbg $prog" > hbm.out
echo " " >> hbm.out
./hbm $dir -n $id -r $rate -t $dur $flags $dbg $prog >> hbm.out 2>&1 &
echo $!
}
processArgs () {
for i in $args ; do
case $i in
# Support for upcomming ingress rate limiting
#in) # support for upcoming ingress rate limiting
# dir="-i"
# dir_name="in"
# ;;
out)
dir="-o"
dir_name="out"
;;
-b=*|--bpf=*)
prog="${i#*=}"
;;
-c=*|--cc=*)
cc="${i#*=}"
;;
--debug)
flags="$flags -d"
debug_flag=1
;;
-d=*|--delay=*)
netem="${i#*=}"
;;
-D)
details=1
;;
-E)
ecn=1
;;
# Support for upcomming fq Early Departure Time egress rate limiting
#--edt)
# prog="hbm_out_edt_kern.o"
# qdisc="fq"
# ;;
-f=*|--flows=*)
flows="${i#*=}"
;;
-i=*|--id=*)
id="${i#*=}"
;;
-l)
flags="$flags -l"
;;
-N)
use_netperf=1
;;
-p=*|--port=*)
port="${i#*=}"
;;
-P)
multi_iperf=1
;;
-q=*)
qdisc="${i#*=}"
;;
-r=*|--rate=*)
rate="${i#*=}"
;;
-R)
rr=1
;;
-s=*|--server=*)
server="${i#*=}"
;;
-S|--stats)
flags="$flags -s"
do_stats=1
;;
-t=*|--time=*)
dur="${i#*=}"
;;
-w)
flags="$flags -w"
;;
cubic)
cc=cubic
;;
dctcp)
cc=dctcp
;;
*)
echo "Unknown arg:$i"
Usage
;;
esac
done
}
processArgs
if [ $debug_flag -eq 1 ] ; then
rm -f hbm_out.log
fi
hbm_pid=$(start_hbm)
usleep 100000
host=`hostname`
cg_base_dir=/sys/fs/cgroup
cg_dir="$cg_base_dir/cgroup-test-work-dir/hbm$id"
echo $$ >> $cg_dir/cgroup.procs
ulimit -l unlimited
rm -f ss.out
rm -f hbm.[0-9]*.$dir_name
if [ $ecn -ne 0 ] ; then
sysctl -w -q -n net.ipv4.tcp_ecn=1
fi
if [ $use_netperf -eq 0 ] ; then
cur_cc=`sysctl -n net.ipv4.tcp_congestion_control`
if [ "$cc" != "x" ] ; then
sysctl -w -q -n net.ipv4.tcp_congestion_control=$cc
fi
fi
if [ "$netem" -ne "0" ] ; then
if [ "$qdisc" != "" ] ; then
echo "WARNING: Ignoring -q options because -d option used"
fi
tc qdisc del dev lo root > /dev/null 2>&1
tc qdisc add dev lo root netem delay $netem\ms > /dev/null 2>&1
elif [ "$qdisc" != "" ] ; then
tc qdisc del dev lo root > /dev/null 2>&1
tc qdisc add dev lo root $qdisc > /dev/null 2>&1
fi
n=0
m=$[$dur * 5]
hn="::1"
if [ $use_netperf -ne 0 ] ; then
if [ "$server" != "" ] ; then
hn=$server
fi
fi
( ping6 -i 0.2 -c $m $hn > ping.out 2>&1 ) &
if [ $use_netperf -ne 0 ] ; then
begNetserverPid=`ps ax | grep netserver | grep --invert-match "grep" | \
awk '{ print $1 }'`
if [ "$begNetserverPid" == "" ] ; then
if [ "$server" == "" ] ; then
( ./netserver > /dev/null 2>&1) &
usleep 100000
fi
fi
flow_cnt=1
if [ "$server" == "" ] ; then
np_server=$host
else
np_server=$server
fi
if [ "$cc" == "x" ] ; then
np_cc=""
else
np_cc="-K $cc,$cc"
fi
replySize=1
while [ $flow_cnt -le $flows ] ; do
if [ $rr -ne 0 ] ; then
reqSize=1M
if [ $flow_cnt -eq 1 ] ; then
reqSize=10K
fi
if [ "$dir" == "-i" ] ; then
replySize=$reqSize
reqSize=1
fi
( ./netperf -H $np_server -l $dur -f m -j -t TCP_RR -- -r $reqSize,$replySize $np_cc -k P50_lATENCY,P90_LATENCY,LOCAL_TRANSPORT_RETRANS,REMOTE_TRANSPORT_RETRANS,LOCAL_SEND_THROUGHPUT,LOCAL_RECV_THROUGHPUT,REQUEST_SIZE,RESPONSE_SIZE > netperf.$id.$flow_cnt ) &
else
if [ "$dir" == "-i" ] ; then
( ./netperf -H $np_server -l $dur -f m -j -t TCP_RR -- -r 1,10M $np_cc -k P50_LATENCY,P90_LATENCY,LOCAL_TRANSPORT_RETRANS,LOCAL_SEND_THROUGHPUT,REMOTE_TRANSPORT_RETRANS,REMOTE_SEND_THROUGHPUT,REQUEST_SIZE,RESPONSE_SIZE > netperf.$id.$flow_cnt ) &
else
( ./netperf -H $np_server -l $dur -f m -j -t TCP_STREAM -- $np_cc -k P50_lATENCY,P90_LATENCY,LOCAL_TRANSPORT_RETRANS,LOCAL_SEND_THROUGHPUT,REQUEST_SIZE,RESPONSE_SIZE > netperf.$id.$flow_cnt ) &
fi
fi
flow_cnt=$[flow_cnt+1]
done
# sleep for duration of test (plus some buffer)
n=$[dur+2]
sleep $n
# force graceful termination of netperf
pids=`pgrep netperf`
for p in $pids ; do
kill -SIGALRM $p
done
flow_cnt=1
rate=0
if [ $details -ne 0 ] ; then
echo ""
echo "Details for HBM in cgroup $id"
if [ $do_stats -eq 1 ] ; then
if [ -e hbm.$id.$dir_name ] ; then
cat hbm.$id.$dir_name
fi
fi
fi
while [ $flow_cnt -le $flows ] ; do
if [ "$dir" == "-i" ] ; then
r=`cat netperf.$id.$flow_cnt | grep -o "REMOTE_SEND_THROUGHPUT=[0-9]*" | grep -o "[0-9]*"`
else
r=`cat netperf.$id.$flow_cnt | grep -o "LOCAL_SEND_THROUGHPUT=[0-9]*" | grep -o "[0-9]*"`
fi
echo "rate for flow $flow_cnt: $r"
rate=$[rate+r]
if [ $details -ne 0 ] ; then
echo "-----"
echo "Details for cgroup $id, flow $flow_cnt"
cat netperf.$id.$flow_cnt
fi
flow_cnt=$[flow_cnt+1]
done
if [ $details -ne 0 ] ; then
echo ""
delay=`grep "avg" ping.out | grep -o "= [0-9.]*/[0-9.]*" | grep -o "[0-9.]*$"`
echo "PING AVG DELAY:$delay"
echo "AGGREGATE_GOODPUT:$rate"
else
echo $rate
fi
elif [ $multi_iperf -eq 0 ] ; then
(iperf3 -s -p $port -1 > /dev/null 2>&1) &
usleep 100000
iperf3 -c $host -p $port -i 0 -P $flows -f m -t $dur > iperf.$id
rates=`grep receiver iperf.$id | grep -o "[0-9.]* Mbits" | grep -o "^[0-9]*"`
rate=`echo $rates | grep -o "[0-9]*$"`
if [ $details -ne 0 ] ; then
echo ""
echo "Details for HBM in cgroup $id"
if [ $do_stats -eq 1 ] ; then
if [ -e hbm.$id.$dir_name ] ; then
cat hbm.$id.$dir_name
fi
fi
delay=`grep "avg" ping.out | grep -o "= [0-9.]*/[0-9.]*" | grep -o "[0-9.]*$"`
echo "PING AVG DELAY:$delay"
echo "AGGREGATE_GOODPUT:$rate"
else
echo $rate
fi
else
flow_cnt=1
while [ $flow_cnt -le $flows ] ; do
(iperf3 -s -p $port -1 > /dev/null 2>&1) &
( iperf3 -c $host -p $port -i 0 -P 1 -f m -t $dur | grep receiver | grep -o "[0-9.]* Mbits" | grep -o "^[0-9]*" | grep -o "[0-9]*$" > iperf3.$id.$flow_cnt ) &
port=$[port+1]
flow_cnt=$[flow_cnt+1]
done
n=$[dur+1]
sleep $n
flow_cnt=1
rate=0
if [ $details -ne 0 ] ; then
echo ""
echo "Details for HBM in cgroup $id"
if [ $do_stats -eq 1 ] ; then
if [ -e hbm.$id.$dir_name ] ; then
cat hbm.$id.$dir_name
fi
fi
fi
while [ $flow_cnt -le $flows ] ; do
r=`cat iperf3.$id.$flow_cnt`
# echo "rate for flow $flow_cnt: $r"
if [ $details -ne 0 ] ; then
echo "Rate for cgroup $id, flow $flow_cnt LOCAL_SEND_THROUGHPUT=$r"
fi
rate=$[rate+r]
flow_cnt=$[flow_cnt+1]
done
if [ $details -ne 0 ] ; then
delay=`grep "avg" ping.out | grep -o "= [0-9.]*/[0-9.]*" | grep -o "[0-9.]*$"`
echo "PING AVG DELAY:$delay"
echo "AGGREGATE_GOODPUT:$rate"
else
echo $rate
fi
fi
if [ $use_netperf -eq 0 ] ; then
sysctl -w -q -n net.ipv4.tcp_congestion_control=$cur_cc
fi
if [ $ecn -ne 0 ] ; then
sysctl -w -q -n net.ipv4.tcp_ecn=0
fi
if [ "$netem" -ne "0" ] ; then
tc qdisc del dev lo root > /dev/null 2>&1
fi
sleep 2
hbmPid=`ps ax | grep "hbm " | grep --invert-match "grep" | awk '{ print $1 }'`
if [ "$hbmPid" == "$hbm_pid" ] ; then
kill $hbm_pid
fi
sleep 1
# Detach any BPF programs that may have lingered
ttx=`bpftool cgroup tree | grep hbm`
v=2
for x in $ttx ; do
if [ "${x:0:36}" == "/sys/fs/cgroup/cgroup-test-work-dir/" ] ; then
cg=$x ; v=0
else
if [ $v -eq 0 ] ; then
id=$x ; v=1
else
if [ $v -eq 1 ] ; then
type=$x ; bpftool cgroup detach $cg $type id $id
v=0
fi
fi
fi
done
if [ $use_netperf -ne 0 ] ; then
if [ "$server" == "" ] ; then
if [ "$begNetserverPid" == "" ] ; then
netserverPid=`ps ax | grep netserver | grep --invert-match "grep" | awk '{ print $1 }'`
if [ "$netserverPid" != "" ] ; then
kill $netserverPid
fi
fi
fi
fi
exit