From: David Gibson <david@gibson.dropbear.id.au>
To: passt-dev@passt.top, Stefano Brivio <sbrivio@redhat.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Subject: [PATCH 4/8] test/perf: Small MTUs for spliced TCP aren't interesting
Date: Mon, 6 Nov 2023 18:08:29 +1100 [thread overview]
Message-ID: <20231106070834.1270986-5-david@gibson.dropbear.id.au> (raw)
In-Reply-To: <20231106070834.1270986-1-david@gibson.dropbear.id.au>
Currently we make TCP throughput measurements for spliced connections with
a number of different MTU values. However, the results from this aren't
really interesting.
Unlike with tap connections, spliced connections only involve the loopback
interface on host and container, not a "real" external interface. lo
typically has an MTU of 65535 and there is very little reason to ever
change that. So, the measurements for smaller MTUs are rarely going to be
relevant.
In addition, the fact that we can offload all the {de,}packetization to the
kernel with splice(2) means that the throughput difference between these
MTUs isn't very great anyway.
Remove the short MTUs and only show spliced throughput for the normal
65535 byte loopback MTU. This reduces runtime of the performance tests on
my laptop by about 1 minute (out of ~24 minutes).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
test/perf/pasta_tcp | 53 +--------------------------------------------
1 file changed, 1 insertion(+), 52 deletions(-)
diff --git a/test/perf/pasta_tcp b/test/perf/pasta_tcp
index a8938c3..3a8ad40 100644
--- a/test/perf/pasta_tcp
+++ b/test/perf/pasta_tcp
@@ -35,39 +35,23 @@ hout FREQ [ -n "__FREQ_CPUFREQ__" ] && echo __FREQ_CPUFREQ__ || echo __FREQ_PROC
info Throughput in Gbps, latency in µs, __THREADS__ threads at __FREQ__ GHz, __STREAMS__ streams each
report pasta lo_tcp __THREADS__ __FREQ__
-th MTU 1500B 4000B 16384B 65535B
+th MTU 65535B
tr TCP throughput over IPv6: ns to host
iperf3s host 100${i}3 __THREADS__
-ns ip link set dev lo mtu 1500
-iperf3 BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 4000
-iperf3 BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 16384
-iperf3 BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 65535
iperf3 BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__
bw __BW__ 15.0 20.0
iperf3k host
tl TCP RR latency over IPv6: ns to host
-lat -
-lat -
-lat -
hostb tcp_rr --nolog -P 10003 -C 10013 -6
nsout LAT tcp_rr --nolog -P 10003 -C 10013 -6 -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
hostw
lat __LAT__ 150 100
tl TCP CRR latency over IPv6: ns to host
-lat -
-lat -
-lat -
hostb tcp_crr --nolog -P 10003 -C 10013 -6
nsout LAT tcp_crr --nolog -P 10003 -C 10013 -6 -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
hostw
@@ -77,34 +61,18 @@ lat __LAT__ 500 350
tr TCP throughput over IPv4: ns to host
iperf3s host 100${i}3 __THREADS__
-ns ip link set dev lo mtu 1500
-iperf3 BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 4000
-iperf3 BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 16384
-iperf3 BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 65535
iperf3 BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__
bw __BW__ 15.0 20.0
iperf3k host
tl TCP RR latency over IPv4: ns to host
-lat -
-lat -
-lat -
hostb tcp_rr --nolog -P 10003 -C 10013 -4
nsout LAT tcp_rr --nolog -P 10003 -C 10013 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
hostw
lat __LAT__ 150 100
tl TCP CRR latency over IPv4: ns to host
-lat -
-lat -
-lat -
hostb tcp_crr --nolog -P 10003 -C 10013 -4
nsout LAT tcp_crr --nolog -P 10003 -C 10013 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
hostw
@@ -113,27 +81,18 @@ lat __LAT__ 500 350
tr TCP throughput over IPv6: host to ns
iperf3s ns 100${i}2 __THREADS__
-bw -
-bw -
-bw -
iperf3 BW host ::1 100${i}2 __THREADS__ __TIME__ __OPTS__
bw __BW__ 15.0 20.0
iperf3k ns
tl TCP RR latency over IPv6: host to ns
-lat -
-lat -
-lat -
nsb tcp_rr --nolog -P 10002 -C 10012 -6
hout LAT tcp_rr --nolog -P 10002 -C 10012 -6 -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
nsw
lat __LAT__ 150 100
tl TCP CRR latency over IPv6: host to ns
-lat -
-lat -
-lat -
nsb tcp_crr --nolog -P 10002 -C 10012 -6
hout LAT tcp_crr --nolog -P 10002 -C 10012 -6 -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
nsw
@@ -143,28 +102,18 @@ lat __LAT__ 1000 700
tr TCP throughput over IPv4: host to ns
iperf3s ns 100${i}2 __THREADS__
-bw -
-bw -
-bw -
iperf3 BW host 127.0.0.1 100${i}2 __THREADS__ __TIME__ __OPTS__
bw __BW__ 15.0 20.0
iperf3k ns
tl TCP RR latency over IPv4: host to ns
-lat -
-lat -
-lat -
nsb tcp_rr --nolog -P 10002 -C 10012 -4
hout LAT tcp_rr --nolog -P 10002 -C 10012 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
nsw
lat __LAT__ 150 100
tl TCP CRR latency over IPv4: host to ns
-lat -
-lat -
-lat -
-sleep 1
nsb tcp_crr --nolog -P 10002 -C 10012 -4
hout LAT tcp_crr --nolog -P 10002 -C 10012 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
nsw
--
@@ -35,39 +35,23 @@ hout FREQ [ -n "__FREQ_CPUFREQ__" ] && echo __FREQ_CPUFREQ__ || echo __FREQ_PROC
info Throughput in Gbps, latency in µs, __THREADS__ threads at __FREQ__ GHz, __STREAMS__ streams each
report pasta lo_tcp __THREADS__ __FREQ__
-th MTU 1500B 4000B 16384B 65535B
+th MTU 65535B
tr TCP throughput over IPv6: ns to host
iperf3s host 100${i}3 __THREADS__
-ns ip link set dev lo mtu 1500
-iperf3 BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 4000
-iperf3 BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 16384
-iperf3 BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 65535
iperf3 BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__
bw __BW__ 15.0 20.0
iperf3k host
tl TCP RR latency over IPv6: ns to host
-lat -
-lat -
-lat -
hostb tcp_rr --nolog -P 10003 -C 10013 -6
nsout LAT tcp_rr --nolog -P 10003 -C 10013 -6 -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
hostw
lat __LAT__ 150 100
tl TCP CRR latency over IPv6: ns to host
-lat -
-lat -
-lat -
hostb tcp_crr --nolog -P 10003 -C 10013 -6
nsout LAT tcp_crr --nolog -P 10003 -C 10013 -6 -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
hostw
@@ -77,34 +61,18 @@ lat __LAT__ 500 350
tr TCP throughput over IPv4: ns to host
iperf3s host 100${i}3 __THREADS__
-ns ip link set dev lo mtu 1500
-iperf3 BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 4000
-iperf3 BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 16384
-iperf3 BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__
-bw __BW__ 15.0 20.0
-ns ip link set dev lo mtu 65535
iperf3 BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__
bw __BW__ 15.0 20.0
iperf3k host
tl TCP RR latency over IPv4: ns to host
-lat -
-lat -
-lat -
hostb tcp_rr --nolog -P 10003 -C 10013 -4
nsout LAT tcp_rr --nolog -P 10003 -C 10013 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
hostw
lat __LAT__ 150 100
tl TCP CRR latency over IPv4: ns to host
-lat -
-lat -
-lat -
hostb tcp_crr --nolog -P 10003 -C 10013 -4
nsout LAT tcp_crr --nolog -P 10003 -C 10013 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
hostw
@@ -113,27 +81,18 @@ lat __LAT__ 500 350
tr TCP throughput over IPv6: host to ns
iperf3s ns 100${i}2 __THREADS__
-bw -
-bw -
-bw -
iperf3 BW host ::1 100${i}2 __THREADS__ __TIME__ __OPTS__
bw __BW__ 15.0 20.0
iperf3k ns
tl TCP RR latency over IPv6: host to ns
-lat -
-lat -
-lat -
nsb tcp_rr --nolog -P 10002 -C 10012 -6
hout LAT tcp_rr --nolog -P 10002 -C 10012 -6 -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
nsw
lat __LAT__ 150 100
tl TCP CRR latency over IPv6: host to ns
-lat -
-lat -
-lat -
nsb tcp_crr --nolog -P 10002 -C 10012 -6
hout LAT tcp_crr --nolog -P 10002 -C 10012 -6 -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
nsw
@@ -143,28 +102,18 @@ lat __LAT__ 1000 700
tr TCP throughput over IPv4: host to ns
iperf3s ns 100${i}2 __THREADS__
-bw -
-bw -
-bw -
iperf3 BW host 127.0.0.1 100${i}2 __THREADS__ __TIME__ __OPTS__
bw __BW__ 15.0 20.0
iperf3k ns
tl TCP RR latency over IPv4: host to ns
-lat -
-lat -
-lat -
nsb tcp_rr --nolog -P 10002 -C 10012 -4
hout LAT tcp_rr --nolog -P 10002 -C 10012 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
nsw
lat __LAT__ 150 100
tl TCP CRR latency over IPv4: host to ns
-lat -
-lat -
-lat -
-sleep 1
nsb tcp_crr --nolog -P 10002 -C 10012 -4
hout LAT tcp_crr --nolog -P 10002 -C 10012 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
nsw
--
2.41.0
next prev parent reply other threads:[~2023-11-06 7:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-06 7:08 [PATCH 0/8] Clean ups and speed ups to benchmarks David Gibson
2023-11-06 7:08 ` [PATCH 1/8] test/perf: Remove stale iperf3c/iperf3s directives David Gibson
2023-11-06 7:08 ` [PATCH 2/8] test/perf: Get iperf3 stats from client side David Gibson
2023-11-06 7:08 ` [PATCH 3/8] test/perf: Start iperf3 server less often David Gibson
2023-11-06 7:08 ` David Gibson [this message]
2023-11-06 7:08 ` [PATCH 5/8] test/perf: Explicitly control UDP packet length, instead of MTU David Gibson
2023-11-06 7:08 ` [PATCH 6/8] test/perf: "MTU" changes in passt_tcp host to guest aren't useful David Gibson
2023-11-06 7:08 ` [PATCH 7/8] test/perf: Remove unnecessary --pacing-timer options David Gibson
2023-11-06 7:08 ` [PATCH 8/8] test/perf: Simplify calculation of "omit" time for TCP throughput David Gibson
2023-11-07 12:45 ` [PATCH 0/8] Clean ups and speed ups to benchmarks Stefano Brivio
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