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Date:   Sat, 21 Oct 2023 10:07:50 +0000
From:   bugzilla-daemon@...nel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 217965] ext4(?) regression since 6.5.0 on sata hdd

https://bugzilla.kernel.org/show_bug.cgi?id=217965

--- Comment #18 from Eduard Kohler (glandvador@...oo.com) ---
Hi Ojaswin,

If you want to replicate something similar to my setup, I better give you more
info about it, because it's not a desktop computer.

It's a very slow system by current standards and I think it may impact why
there aren't more people complaining about this issue. In Ivan's case it seems
that after a small while, it recovered even with a lot of files. His setup
seems more powerful than mine. In my case pulling a 75MB container with podman
didn't recovered after 2 hours of 100% CPU.

The system has 4G RAM:
# free
               total        used        free      shared  buff/cache  
available
Mem:         3977448      615760      410332       14580     2951356    
3045304
Swap:        1564668           0     1564668

and an AMD G-T40E processor:
# cat /proc/cpuinfo 
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 20
model           : 2
model name      : AMD G-T40E Processor
stepping        : 0
microcode       : 0x5000119
cpu MHz         : 801.798
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb
rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf
pni monitor ssse3 cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm
sse4a misalignsse 3dnowprefetch ibs skinit wdt hw_pstate vmmcall arat npt lbrv
svm_lock nrip_save pausefilter
bugs            : fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2
spec_store_bypass
bogomips        : 1999.82
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate

processor       : 1
vendor_id       : AuthenticAMD
cpu family      : 20
model           : 2
model name      : AMD G-T40E Processor
stepping        : 0
microcode       : 0x5000119
cpu MHz         : 799.941
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
apicid          : 1
initial apicid  : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb
rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf
pni monitor ssse3 cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm
sse4a misalignsse 3dnowprefetch ibs skinit wdt hw_pstate vmmcall arat npt lbrv
svm_lock nrip_save pausefilter
bugs            : fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2
spec_store_bypass
bogomips        : 1999.82
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate

The raid1 underlying hardware changed from the 2013 from 1T -> 2T -> 4T HDD.
The file system grew up accordingly. During the step 2T -> 4T disk layout was
converted from MBR to GPT:
# gdisk -l /dev/sdb
GPT fdisk (gdisk) version 1.0.9

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sdb: 7814037168 sectors, 3.6 TiB
Model: ST4000VN008-2DR1
Sector size (logical/physical): 512/4096 bytes
Disk identifier (GUID): CD6E68D9-1A0F-40F7-9755-FDE136159F92
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 7814037134
Partitions will be aligned on 2048-sector boundaries
Total free space is 1537100 sectors (750.5 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048      7812502048   3.6 TiB     8300  primary

And again the raid1 md0 partition table:
# gdisk -l /dev/md0
GPT fdisk (gdisk) version 1.0.9

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/md0: 7812237857 sectors, 3.6 TiB
Sector size (logical/physical): 512/4096 bytes
Disk identifier (GUID): 46C6A662-69D1-492D-A31F-1121048F9FE3
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 7812237823
Partitions will be aligned on 2048-sector boundaries
Total free space is 3933 sectors (1.9 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048      7812235904   3.6 TiB     8300  Linux filesystem

Last one is the EXT4 filesystem.

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