Re: [PATCH v2] test: Update the threshold value for some perf tests

[David Gibson <david@gibson.dropbear.id.au>]

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On Mon, Oct 13, 2025 at 09:31:41AM +0800, Yumei Huang wrote:
> The values are adjusted to better match results observerd on the
> test hardware with 56-core Xeon Gold 6330 CPU and 126 GB RAM.

Interesting.  That CPU is older than the one on my laptop (i7-12800H),
which comfortably hit the old thresholds, but by less than a year (Q2
2021 versus Q1 2022).  At the same time it's a much fancier model for
its generation.  I thought the Xeons might have been built with better
memory bandwidth which probably has more effect on passt than the
CPU's computational speed.

I'm not certain what machine Stefano was using to estimate the
existing thresholds, but I'm guessing it was passt.top which is an AMD
Ryzen 5 3600 - older than both of the above (2019).

passt is single threaded so the Xeon's many cores wouldn't help it,
but it's still surprising that it can't keep up with the other
machines we've tried on.

> 
> Link: https://bugs.passt.top/show_bug.cgi?id=156
> Signed-off-by: Yumei Huang <yuhuang@redhat.com>
> ---
>  test/perf/passt_tcp | 6 +++---
>  test/perf/pasta_udp | 8 ++++----
>  2 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/test/perf/passt_tcp b/test/perf/passt_tcp
> index 5978c49..1a97a63 100644
> --- a/test/perf/passt_tcp
> +++ b/test/perf/passt_tcp
> @@ -87,7 +87,7 @@ lat	-
>  lat	-
>  nsb	tcp_crr --nolog -6
>  gout	LAT tcp_crr --nolog -l1 -6 -c -H __MAP_NS6__ | sed -n 's/^throughput=\(.*\)/\1/p'
> -lat	__LAT__ 500 400
> +lat	__LAT__ 550 450
>  
>  tr	TCP throughput over IPv4: guest to host
>  iperf3s	ns 10002
> @@ -137,7 +137,7 @@ lat	-
>  lat	-
>  nsb	tcp_crr --nolog -4
>  gout	LAT tcp_crr --nolog -l1 -4 -c -H __MAP_NS4__ | sed -n 's/^throughput=\(.*\)/\1/p'
> -lat	__LAT__ 500 400
> +lat	__LAT__ 550 450
>  
>  tr	TCP throughput over IPv6: host to guest
>  iperf3s	guest 10001
> @@ -208,6 +208,6 @@ lat	-
>  guestb	tcp_crr --nolog -P 10001 -C 10011 -4
>  sleep	1
>  nsout	LAT tcp_crr --nolog -l1 -P 10001 -C 10011 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
> -lat	__LAT__ 500 300
> +lat	__LAT__ 500 350
>  
>  te
> diff --git a/test/perf/pasta_udp b/test/perf/pasta_udp
> index 3a7054c..c51bb6c 100644
> --- a/test/perf/pasta_udp
> +++ b/test/perf/pasta_udp
> @@ -39,7 +39,7 @@ iperf3s	host 10003
>  # (datagram size) = (packet size) - 48: 40 bytes of IPv6 header, 8 of UDP header
>  
>  iperf3	BW ns ::1 10003 __TIME__ __OPTS__ -b 5G -l 1452
> -bw	__BW__ 1.0 1.5
> +bw	__BW__ 0.8 1.2
>  iperf3	BW ns ::1 10003 __TIME__ __OPTS__ -b 10G -l 3972
>  bw	__BW__ 1.2 1.8
>  iperf3	BW ns ::1 10003 __TIME__ __OPTS__ -b 30G -l 16336
> @@ -64,7 +64,7 @@ iperf3s	host 10003
>  # (datagram size) = (packet size) - 28: 20 bytes of IPv4 header, 8 of UDP header
>  
>  iperf3	BW ns 127.0.0.1 10003 __TIME__ __OPTS__ -b 5G -l 1372
> -bw	__BW__ 1.0 1.5
> +bw	__BW__ 0.8 1.2
>  iperf3	BW ns 127.0.0.1 10003 __TIME__ __OPTS__ -b 10G -l 3972
>  bw	__BW__ 1.2 1.8
>  iperf3	BW ns 127.0.0.1 10003 __TIME__ __OPTS__ -b 30G -l 16356
> @@ -88,7 +88,7 @@ tr	UDP throughput over IPv6: host to ns
>  iperf3s	ns 10002
>  
>  iperf3	BW host ::1 10002 __TIME__ __OPTS__ -b 5G -l 1452
> -bw	__BW__ 1.0 1.5
> +bw	__BW__ 0.8 1.2
>  iperf3	BW host ::1 10002 __TIME__ __OPTS__ -b 10G -l 3972
>  bw	__BW__ 1.2 1.8
>  iperf3	BW host ::1 10002 __TIME__ __OPTS__ -b 30G -l 16336
> @@ -111,7 +111,7 @@ lat	__LAT__ 200 150
>  tr	UDP throughput over IPv4: host to ns
>  iperf3s	ns 10002
>  iperf3	BW host 127.0.0.1 10002 __TIME__ __OPTS__ -b 5G -l 1372
> -bw	__BW__ 1.0 1.5
> +bw	__BW__ 0.8 1.2
>  iperf3	BW host 127.0.0.1 10002 __TIME__ __OPTS__ -b 10G -l 3972
>  bw	__BW__ 1.2 1.8
>  iperf3	BW host 127.0.0.1 10002 __TIME__ __OPTS__ -b 30G -l 16356
> -- 
> 2.47.0
> 

-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

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