Date: Sun, 3 Jan 2021 18:58:05 +0000 From: Andy McClements <ajm@ip-ether.net> To: freebsd-arm@freebsd.org Subject: RPi4b 13.0-Current, big performance hit with HDMI connected Message-ID: <654ae9bb-012a-ccfe-3656-7bb100bca6a0@ip-ether.net>
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This may not be news to folks around here but it suprised me.
I was just doing some very quick performance checks having got my RPi4b
to boot from SSD. I wanted to verify CPU frequency scaling was working
so did a quick net and disk throughput check.
Any insights on this would be most welcome.
Results:
HDMI connected
==============
root@generic:~ # iperf3 -c 10.0.30.30
Connecting to host 10.0.30.30, port 5201
[ 5] local 10.0.30.130 port 60995 connected to 10.0.30.30 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.01 sec 75.0 MBytes 625 Mbits/sec 0 209 KBytes
[ 5] 1.01-2.00 sec 76.2 MBytes 641 Mbits/sec 0 209 KBytes
[ 5] 2.00-3.00 sec 76.7 MBytes 645 Mbits/sec 0 209 KBytes
root@generic:~ # diskinfo -t /dev/da0
<snip>
Transfer rates:
outside: 102400 kbytes in 0.694994 sec = 147339
kbytes/sec
middle: 102400 kbytes in 0.692708 sec = 147826
kbytes/sec
inside: 102400 kbytes in 0.692531 sec = 147863
kbytes/sec
HDMI disconnected
=================
root@generic:~ # iperf3 -c 10.0.30.30
Connecting to host 10.0.30.30, port 5201
[ 5] local 10.0.30.130 port 60384 connected to 10.0.30.30 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 113 MBytes 946 Mbits/sec 0 208 KBytes
[ 5] 1.00-2.00 sec 113 MBytes 947 Mbits/sec 0 208 KBytes
[ 5] 2.00-3.00 sec 113 MBytes 947 Mbits/sec 0 208 KBytes
[ 5] 3.00-4.00 sec 113 MBytes 947 Mbits/sec 0 208 KBytes
root@generic:~ # diskinfo -t /dev/da0
<snip>
Transfer rates:
outside: 102400 kbytes in 0.541603 sec = 189068
kbytes/sec
middle: 102400 kbytes in 0.468219 sec = 218701
kbytes/sec
inside: 102400 kbytes in 0.473097 sec = 216446
kbytes/sec
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