Pi 4B seems to run much slower on Debian Bookworm than Debian Bullseye. (This is not about the Raspberry Pi OS.)
While overclocking a Pi 4B I ran the hardinfo included benchmarks and was surprised to see that the results were poor when running Bookwork as compared to Bullseye (and R-Pi OS.) I've started using the sysbench CPU benchmark as it is quick (10s), seems to produce similar results (and does not require a GUI.) Examples are
Bullseye
hbarta@kweli:~$ time sysbench --test=cpu --cpu-max-prime=20000 run
WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Prime numbers limit: 20000
Initializing worker threads...
Threads started!
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
real 0m10.022s
user 0m9.994s
sys 0m0.008s
hbarta@kweli:~$
Bookworm
root@kweli-t:/home/hbarta# time sysbench --test=cpu --cpu-max-prime=20000 run
WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Prime numbers limit: 20000
Initializing worker threads...
Threads started!
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
real 0m10.051s
user 0m10.034s
sys 0m0.016s
root@kweli-t:/home/hbarta#
Going forward (unless someone requests a different benchmark) I will report the "total number of events" which are 5850/Bullseye and 2333/Bookworm in this sample.
Working with diederik on https://webchat.oftc.net/?channels=debian-raspberrypi, tried the following:
Install the 5.17 kernel from experimental backports. No change.
Download and install an older kernel (*)
sudo apt install \
./linux-headers-5.14.0-trunk-arm64_5.14-1~exp2_arm64.deb \
./linux-headers-5.14.0-trunk-common_5.14-1~exp2_all.deb \
./linux-image-5.14.0-trunk-arm64-unsigned_5.14-1~exp2_arm64.deb \
./linux-kbuild-5.14_5.14-1~exp2_arm64.deb
Locate, download and install the kernel from Bullseye.
sudo apt install \
./linux-headers-5.10.0-10-arm64_5.10.84-1_arm64.deb \
./linux-headers-5.10.0-10-common_5.10.84-1_all.deb \
./linux-headers-arm64_5.10.84-1_arm64.deb \
./linux-image-arm64_5.10.84-1_arm64.deb \
./linux-kbuild-5.10_5.10.84-1_arm64.deb \
./linux-image-5.10.0-10-arm64_5.10.84-1_arm64.deb
(*) I had ZFS installed and this required DKMS and the kernel headers. And took longer. :-/
None of these changes improved performance. diederik suggested posting to the debian-arm mailing list so I'm collecting my notes, will perform a clean install (w/out ZFS) and start from there.
Using 20220121_raspi_4_bookworm.img.xz
fell off scroll buffer
After apt update;apt upgrade and reboot (and misc like adduser set timezone etc.)
hbarta@up:~$ sysbench --test=cpu --cpu-max-prime=20000 run
WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Prime numbers limit: 20000
Initializing worker threads...
Threads started!
CPU speed:
events per second: 231.82
General statistics:
total time: 10.0042s
total number of events: 2321
Latency (ms):
min: 4.28
avg: 4.31
max: 5.69
95th percentile: 4.49
sum: 10001.82
Threads fairness:
events (avg/stddev): 2321.0000/0.00
execution time (avg/stddev): 10.0018/0.00
hbarta@up:~$
Edit /boot/firmware/config.txt to revert kernel to 5.15.
hbarta@up:~$ sysbench --test=cpu --cpu-max-prime=20000 run
WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Prime numbers limit: 20000
Initializing worker threads...
Threads started!
CPU speed:
events per second: 232.14
General statistics:
total time: 10.0030s
total number of events: 2324
Latency (ms):
min: 4.28
avg: 4.30
max: 5.12
95th percentile: 4.33
sum: 10000.07
Threads fairness:
events (avg/stddev): 2324.0000/0.00
execution time (avg/stddev): 10.0001/0.00
hbarta@up:~$ uname -a
Linux up 5.15.0-2-arm64 #1 SMP Debian 5.15.5-2 (2021-12-18) aarch64 GNU/Linux
hbarta@up:~$
Repeating fresh install to collect further information.
Detailed log.
adduser hbarta
hbarta@rpi4-20220121:~$ lscpu
Architecture: aarch64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Vendor ID: ARM
Model name: Cortex-A72
Model: 3
Thread(s) per core: 1
Core(s) per cluster: 4
Socket(s): -
Cluster(s): 1
Stepping: r0p3
CPU max MHz: 1500.0000
CPU min MHz: 600.0000
BogoMIPS: 108.00
Flags: fp asimd evtstrm crc32 cpuid
NUMA:
NUMA node(s): 1
NUMA node0 CPU(s): 0-3
Vulnerabilities:
Itlb multihit: Not affected
L1tf: Not affected
Mds: Not affected
Meltdown: Not affected
Spec store bypass: Vulnerable
Spectre v1: Mitigation; __user pointer sanitization
Spectre v2: Vulnerable
Srbds: Not affected
Tsx async abort: Not affected
hbarta@rpi4-20220121:~$
Of note the line
CPU max MHz: 1500.0000
Does not appear following upgrade.
As root
apt update
apt install sysbench
103 packages to update.
root@rpi4-20220121:~# apt install sytsbench
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package sytsbench
root@rpi4-20220121:~# apt install sysbench
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
libaio1 libldap-2.4-2 libldap-common libluajit-5.1-2 libluajit-5.1-common libmariadb3 libpq5 libsasl2-2 libsasl2-modules libsasl2-modules-db mariadb-common mysql-common
Suggested packages:
libsasl2-modules-gssapi-mit | libsasl2-modules-gssapi-heimdal libsasl2-modules-ldap libsasl2-modules-otp libsasl2-modules-sql
The following NEW packages will be installed:
libaio1 libldap-2.4-2 libldap-common libluajit-5.1-2 libluajit-5.1-common libmariadb3 libpq5 libsasl2-2 libsasl2-modules libsasl2-modules-db mariadb-common mysql-common
sysbench
0 upgraded, 13 newly installed, 0 to remove and 103 not upgraded.
Need to get 1379 kB of archives.
After this operation, 3824 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
...
sysbench after update and upgrade not performed.
hbarta@rpi4-20220121:~$ sysbench --test=cpu --cpu-max-prime=20000 run
WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Prime numbers limit: 20000
Initializing worker threads...
Threads started!
CPU speed:
events per second: 582.83
General statistics:
total time: 10.0009s
total number of events: 5831
Latency (ms):
min: 1.71
avg: 1.71
max: 2.62
95th percentile: 1.73
sum: 9998.72
Threads fairness:
events (avg/stddev): 5831.0000/0.00
execution time (avg/stddev): 9.9987/0.00
hbarta@rpi4-20220121:~$
Packages pending upgrade
barta@rpi4-20220121:~$ apt list --upgradable
Listing... Done
adduser/testing 3.120 all [upgradable from: 3.118]
apparmor/testing 3.0.4-2 arm64 [upgradable from: 3.0.3-6]
apt-utils/testing 2.4.1 arm64 [upgradable from: 2.3.14]
apt/testing 2.4.1 arm64 [upgradable from: 2.3.14]
base-files/testing 12.2 arm64 [upgradable from: 12]
bsdutils/testing 1:2.37.3-1+b1 arm64 [upgradable from: 1:2.37.2-6]
ca-certificates/testing 20211016 all [upgradable from: 20210119]
dash/testing 0.5.11+git20210903+057cd650a4ed-7 arm64 [upgradable from: 0.5.11+git20210903+057cd650a4ed-3]
dbus-bin/testing 1.14.0-1 arm64 [upgradable from: 1.12.20-3]
dbus-daemon/testing 1.14.0-1 arm64 [upgradable from: 1.12.20-3]
dbus-session-bus-common/testing 1.14.0-1 all [upgradable from: 1.12.20-3]
dbus-system-bus-common/testing 1.14.0-1 all [upgradable from: 1.12.20-3]
dbus/testing 1.14.0-1 arm64 [upgradable from: 1.12.20-3]
debianutils/testing 5.7-0.1 arm64 [upgradable from: 4.11.2]
fdisk/testing 2.37.3-1+b1 arm64 [upgradable from: 2.37.2-6]
findutils/testing 4.9.0-2 arm64 [upgradable from: 4.8.0-1]
gcc-10-base/testing 10.3.0-14 arm64 [upgradable from: 10.3.0-13]
gcc-11-base/testing 11.2.0-16 arm64 [upgradable from: 11.2.0-14]
ifupdown/testing 0.8.37 arm64 [upgradable from: 0.8.36+nmu1]
init-system-helpers/testing 1.62 all [upgradable from: 1.61]
init/testing 1.62 arm64 [upgradable from: 1.61]
iproute2/testing 5.16.0-2 arm64 [upgradable from: 5.16.0-1]
iputils-ping/testing 3:20211215-1 arm64 [upgradable from: 3:20210202-1]
isc-dhcp-client/testing 4.4.2-P1-1 arm64 [upgradable from: 4.4.1-2.3]
isc-dhcp-common/testing 4.4.2-P1-1 arm64 [upgradable from: 4.4.1-2.3]
klibc-utils/testing 2.0.10-4 arm64 [upgradable from: 2.0.10-3]
libapparmor1/testing 3.0.4-2 arm64 [upgradable from: 3.0.3-6]
libapt-pkg6.0/testing 2.4.1 arm64 [upgradable from: 2.3.14]
libargon2-1/testing 0~20171227-0.3 arm64 [upgradable from: 0~20171227-0.2]
libaudit-common/testing 1:3.0.7-1 all [upgradable from: 1:3.0.6-1]
libaudit1/testing 1:3.0.7-1 arm64 [upgradable from: 1:3.0.6-1+b1]
libblkid1/testing 2.37.3-1+b1 arm64 [upgradable from: 2.37.2-6]
libbpf0/testing 1:0.7.0-2 arm64 [upgradable from: 1:0.5.0-1]
libbsd0/testing 0.11.5-1+b1 arm64 [upgradable from: 0.11.3-1]
libc-bin/testing 2.33-7 arm64 [upgradable from: 2.33-2]
libc6/testing 2.33-7 arm64 [upgradable from: 2.33-2]
libcrypt1/testing 1:4.4.27-1.1 arm64 [upgradable from: 1:4.4.27-1]
libdbus-1-3/testing 1.14.0-1 arm64 [upgradable from: 1.12.20-3]
libexpat1/testing 2.4.4-1 arm64 [upgradable from: 2.4.3-1]
libfdisk1/testing 2.37.3-1+b1 arm64 [upgradable from: 2.37.2-6]
libffi8/testing 3.4.2-4 arm64 [upgradable from: 3.4.2-3]
libfido2-1/testing 1.10.0-1 arm64 [upgradable from: 1.9.0-2]
libgcc-s1/testing 12-20220302-1 arm64 [upgradable from: 11.2.0-14]
libgnutls30/testing 3.7.3-4+b1 arm64 [upgradable from: 3.7.2-5]
libgpg-error0/testing 1.43-3 arm64 [upgradable from: 1.43-1]
libgssapi-krb5-2/testing 1.19.2-2 arm64 [upgradable from: 1.18.3-7]
libk5crypto3/testing 1.19.2-2 arm64 [upgradable from: 1.18.3-7]
libkeyutils1/testing 1.6.1-3 arm64 [upgradable from: 1.6.1-2]
libklibc/testing 2.0.10-4 arm64 [upgradable from: 2.0.10-3]
libkrb5-3/testing 1.19.2-2 arm64 [upgradable from: 1.18.3-7]
libkrb5support0/testing 1.19.2-2 arm64 [upgradable from: 1.18.3-7]
liblocale-gettext-perl/testing 1.07-4+b2 arm64 [upgradable from: 1.07-4+b1]
libmount1/testing 2.37.3-1+b1 arm64 [upgradable from: 2.37.2-6]
libncurses6/testing 6.3-2 arm64 [upgradable from: 6.3-1]
libncursesw6/testing 6.3-2 arm64 [upgradable from: 6.3-1]
libnftables1/testing 1.0.2-1 arm64 [upgradable from: 1.0.1-1]
libnl-3-200/testing 3.5.0-0.1 arm64 [upgradable from: 3.4.0-1+b1]
libnl-genl-3-200/testing 3.5.0-0.1 arm64 [upgradable from: 3.4.0-1+b1]
libnl-route-3-200/testing 3.5.0-0.1 arm64 [upgradable from: 3.4.0-1+b1]
libpam-systemd/testing 250.3-2 arm64 [upgradable from: 250.2-3]
libpcsclite1/testing 1.9.5-3 arm64 [upgradable from: 1.9.5-1]
libprocps8/testing 2:3.3.17-7+b1 arm64 [upgradable from: 2:3.3.17-6]
libselinux1/testing 3.3-1+b2 arm64 [upgradable from: 3.3-1+b1]
libsemanage2/testing 3.3-1+b2 arm64 [upgradable from: 3.3-1+b1]
libsmartcols1/testing 2.37.3-1+b1 arm64 [upgradable from: 2.37.2-6]
libstdc++6/testing 12-20220302-1 arm64 [upgradable from: 11.2.0-14]
libsystemd0/testing 250.3-2 arm64 [upgradable from: 250.2-3]
libtext-charwidth-perl/testing 0.04-10+b2 arm64 [upgradable from: 0.04-10+b1]
libtext-iconv-perl/testing 1.7-7+b2 arm64 [upgradable from: 1.7-7+b1]
libtinfo6/testing 6.3-2 arm64 [upgradable from: 6.3-1]
libudev1/testing 250.3-2 arm64 [upgradable from: 250.2-3]
libunistring2/testing 1.0-1 arm64 [upgradable from: 0.9.10-6]
libuuid1/testing 2.37.3-1+b1 arm64 [upgradable from: 2.37.2-6]
libxmuu1/testing 2:1.1.3-3 arm64 [upgradable from: 2:1.1.2-2+b3]
linux-base/testing 4.8 all [upgradable from: 4.7]
linux-image-arm64/testing 5.16.12-1 arm64 [upgradable from: 5.15.5-2]
login/testing 1:4.11.1+dfsg1-2 arm64 [upgradable from: 1:4.8.1-2]
logrotate/testing 3.19.0-2 arm64 [upgradable from: 3.19.0-1]
mawk/testing 1.3.4.20200120-3 arm64 [upgradable from: 1.3.4.20200120-2]
mount/testing 2.37.3-1+b1 arm64 [upgradable from: 2.37.2-6]
nano/testing 6.2-1 arm64 [upgradable from: 6.0-1]
ncurses-base/testing 6.3-2 all [upgradable from: 6.3-1]
ncurses-bin/testing 6.3-2 arm64 [upgradable from: 6.3-1]
ncurses-term/testing 6.3-2 all [upgradable from: 6.3-1]
nftables/testing 1.0.2-1 arm64 [upgradable from: 1.0.1-1]
openssh-client/testing 1:8.9p1-3 arm64 [upgradable from: 1:8.7p1-4]
openssh-server/testing 1:8.9p1-3 arm64 [upgradable from: 1:8.7p1-4]
openssh-sftp-server/testing 1:8.9p1-3 arm64 [upgradable from: 1:8.7p1-4]
passwd/testing 1:4.11.1+dfsg1-2 arm64 [upgradable from: 1:4.8.1-2]
perl-base/testing 5.34.0-3 arm64 [upgradable from: 5.32.1-6]
procps/testing 2:3.3.17-7+b1 arm64 [upgradable from: 2:3.3.17-6]
raspi-firmware/testing 1.20220120+ds-1 arm64 [upgradable from: 1.20210805+ds-1]
rsyslog/testing 8.2202.0-1 arm64 [upgradable from: 8.2112.0-2]
ssh/testing 1:8.9p1-3 all [upgradable from: 1:8.7p1-4]
systemd-sysv/testing 250.3-2 arm64 [upgradable from: 250.2-3]
systemd-timesyncd/testing 250.3-2 arm64 [upgradable from: 250.2-3]
systemd/testing 250.3-2 arm64 [upgradable from: 250.2-3]
tasksel-data/testing 3.69+rebuild all [upgradable from: 3.68]
tasksel/testing 3.69+rebuild all [upgradable from: 3.68]
udev/testing 250.3-2 arm64 [upgradable from: 250.2-3]
util-linux/testing 2.37.3-1+b1 arm64 [upgradable from: 2.37.2-6]
vim-tiny/testing 2:8.2.3995-1+b2 arm64 [upgradable from: 2:8.2.3995-1]
xxd/testing 2:8.2.3995-1+b2 arm64 [upgradable from: 2:8.2.3995-1]
hbarta@rpi4-20220121:~$
To further track down the cause I started installing some packages that I thought might be the culprit and installed the following from the list of updates. Packages paired together were installed together and following each install I rebooted and tested using lscpu and sysbench. Following the install of raspi-firmware the performance regression appeared.
init-system-helpers/testing 1.62 all [upgradable from: 1.61]
init/testing 1.62 arm64 [upgradable from: 1.61]
libbpf0/testing 1:0.7.0-2 arm64 [upgradable from: 1:0.5.0-1]
libprocps8/testing 2:3.3.17-7+b1 arm64 [upgradable from: 2:3.3.17-6]
procps/testing 2:3.3.17-7+b1 arm64 [upgradable from: 2:3.3.17-6]
libsystemd0/testing 250.3-2 arm64 [upgradable from: 250.2-3]
systemd/testing 250.3-2 arm64 [upgradable from: 250.2-3]
libudev1/testing 250.3-2 arm64 [upgradable from: 250.2-3]
raspi-firmware/testing 1.20220120+ds-1 arm64 [upgradable from: 1.20210805+ds-1]
Using the sysbench fileio test (from https://raspberrypi.stackexchange.com/questions/3371/how-can-i-stress-test-my-raspberry-pi)
time sysbench --test=fileio --file-total-size=2G prepare
time sysbench --test=fileio --file-total-size=2G --file-test-mode=rndrw --max-time=300 --max-requests=0 run
time sysbench --test=fileio --file-total-size=2G cleanup
hbarta@down:~$ time sysbench --test=fileio --file-total-size=2G prepare
WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
128 files, 16384Kb each, 2048Mb total
Creating files for the test...
Extra file open flags: (none)
Creating file test_file.0
Creating file test_file.1
...
Creating file test_file.126
Creating file test_file.127
2147483648 bytes written in 113.43 seconds (18.05 MiB/sec).
real 1m53.458s
user 0m0.153s
sys 0m13.913s
hbarta@down:~$
hbarta@down:~$ time sysbench --test=fileio --file-total-size=2G --file-test-mode=rndrw --max-time=300 --max-requests=0 run
WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
WARNING: --max-time is deprecated, use --time instead
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Extra file open flags: (none)
128 files, 16MiB each
2GiB total file size
Block size 16KiB
Number of IO requests: 0
Read/Write ratio for combined random IO test: 1.50
Periodic FSYNC enabled, calling fsync() each 100 requests.
Calling fsync() at the end of test, Enabled.
Using synchronous I/O mode
Doing random r/w test
Initializing worker threads...
Threads started!
File operations:
reads/s: 6.22
writes/s: 4.15
fsyncs/s: 13.34
Throughput:
read, MiB/s: 0.10
written, MiB/s: 0.06
General statistics:
total time: 308.4489s
total number of events: 7188
Latency (ms):
min: 0.00
avg: 41.79
max: 9009.86
95th percentile: 68.05
sum: 300392.74
Threads fairness:
events (avg/stddev): 7188.0000/0.00
execution time (avg/stddev): 300.3927/0.00
real 5m8.482s
user 0m0.027s
sys 0m0.333s
hbarta@down:~$
hbarta@down:~$ time sysbench --test=fileio --file-total-size=2G cleanup
WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Removing test files...
real 0m0.651s
user 0m0.012s
sys 0m0.627s
hbarta@down:~$
Upgrade raspi-firmware
raspi-firmware/testing 1.20220120+ds-1 arm64 [upgradable from: 1.20210805+ds-1]
hbarta@down:~$ time sysbench --test=fileio --file-total-size=2G prepare
WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
128 files, 16384Kb each, 2048Mb total
Creating files for the test...
Extra file open flags: (none)
Creating file test_file.0
Creating file test_file.1
...
Creating file test_file.126
Creating file test_file.127
2147483648 bytes written in 113.46 seconds (18.05 MiB/sec).
real 1m53.568s
user 0m0.160s
sys 0m17.705s
hbarta@down:~$
hbarta@down:~$ time sysbench --test=fileio --file-total-size=2G --file-test-mode=rndrw --max-time=300 --max-requests=0 run
WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
WARNING: --max-time is deprecated, use --time instead
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Extra file open flags: (none)
128 files, 16MiB each
2GiB total file size
Block size 16KiB
Number of IO requests: 0
Read/Write ratio for combined random IO test: 1.50
Periodic FSYNC enabled, calling fsync() each 100 requests.
Calling fsync() at the end of test, Enabled.
Using synchronous I/O mode
Doing random r/w test
Initializing worker threads...
Threads started!
File operations:
reads/s: 5.73
writes/s: 3.82
fsyncs/s: 12.36
Throughput:
read, MiB/s: 0.09
written, MiB/s: 0.06
General statistics:
total time: 303.5714s
total number of events: 6525
Latency (ms):
min: 0.01
avg: 46.02
max: 1880.98
95th percentile: 634.66
sum: 300250.09
Threads fairness:
events (avg/stddev): 6525.0000/0.00
execution time (avg/stddev): 300.2501/0.00
real 5m3.658s
user 0m0.050s
sys 0m0.291s
hbarta@down:~$
hbarta@down:~$ time sysbench --test=fileio --file-total-size=2G cleanup
WARNING: the --test option is deprecated. You can pass a script name or path on the command line without any options.
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Removing test files...
real 0m1.648s
user 0m0.020s
sys 0m1.614s
hbarta@down:~$
https://github.com/raspberrypi/firmware/tags?
Procedure (suggested by Diederik de Haas.)
-
Install fresh copy of OS and update/upgrade all packages except
raspi-config -
Reboot and confirm normal operation
-
Save a copy of /boot/firmware
-
Download a tag (choose by binary search/bisect)
-
Extract somewhere convenient.
-
Copy
bootcode.bin,*.datand*.elfto/boot/firmware/ -
Reboot and test
-
rinse repeat.
| tag | result | comment |
|---|---|---|
| 1.20211007 | good | |
| 1.20220118 | bad | |
| 1.20211029 | good | |
| 1.20211118 | good | |
| 1.20220308 | bad | most recent |
| 1.20211118 | good | double check |