Package: raspi-firmware
Version: 1.20220120+ds-1
Severity: important
Tags: upstream
Hank Barta reported a performance regression under the Raspberry Pi
4B, after comparing Bullseye and Bookworm (Debian 11 and 12). I am
copying over to this bug report only part of the information; a
full(er) report is available in Hank's GitHub project
Pi-4B-bookworm-performance:
https://github.com/HankB/Pi-4B-bookworm-performance
The problem presented when running sysbench:
/--- bullseye ↓
| $ time sysbench --test=cpu --cpu-max-prime=20000 run
| (...)
| CPU speed:
| events per second: 584.72
|
| General statistics:
| total time: 10.0006s
| total number of events: 5850
| Latency (ms):
| min: 1.70
| avg: 1.71
| max: 2.99
| 95th percentile: 1.73
| sum: 9997.34
|
| Threads fairness:
| events (avg/stddev): 5850.0000/0.00
| execution time (avg/stddev): 9.9973/0.00
+--- bookworm ↓
| # time sysbench --test=cpu --cpu-max-prime=20000 run
| (...)
| CPU speed:
| events per second: 233.03
|
| General statistics:
| total time: 10.0038s
| total number of events: 2333
|
| Latency (ms):
| min: 4.28
| avg: 4.29
| max: 4.34
| 95th percentile: 4.33
| sum: 10001.67
|
| Threads fairness:
| events (avg/stddev): 2333.0000/0.00
| execution time (avg/stddev): 10.0017/0.00
\---
Hank did a thorough saerch, and found out this issue happens after the
firmware update (raspi-firmware/testing 1.20220120+ds-1 arm64
[upgradable from: 1.20210805+ds-1]).
Further information is available on the debian-arm mailing list
thread:
https://lists.debian.org/debian-arm/2022/03/threads.html#00003
I prompted Hank to report this issue to the Raspberrrypi Firmware
project in GitHub, which he did, but was outright dismissed:
https://github.com/raspberrypi/firmware/issues/1705
-- System Information:
Debian Release: bookworm/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Kernel: Linux 5.16.0-3-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
--
Attachment:
signature.asc
Description: PGP signature