linux-ext4 - [Bug 217965] ext4(?) regression since 6.5.0 on sata hdd

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Message-ID: <bug-217965-13602-AVoESEUTYG@https.bugzilla.kernel.org/>
Date: Sat, 18 Nov 2023 13:17:59 +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 #41 from Eyal Lebedinsky (bugzilla@...l.emu.id.au) ---
OK, so how do I disable the stripe=640 that was automatically added?
Is there a mount option to disable it?
I would rather not futz with tune2fs.

RE kernel build: I used to often do this maybe 30 years ago, but on a
workstation, not on the server. The build I expect to be simple, but it is the
risk of a bad patch that worries me. I would rather not do that.

BTW, while you are looking at the cache issue, what are your thoughts on the
fact that the array shows (iostat -x) a very high w_await when the members are
much lower? Is it normal?

         Device            r/s     rkB/s   rrqm/s  %rrqm r_await rareq-sz    
w/s     wkB/s   wrqm/s  %wrqm w_await wareq-sz     d/s     dkB/s   drqm/s 
%drqm d_await dareq-sz     f/s f_await  aqu-sz  %util
16:04:08 md127            0.20      0.80     0.00   0.00   10.50     4.00   
9.80    739.20     0.00   0.00 1495.44    75.43    0.00      0.00     0.00  
0.00    0.00     0.00    0.00    0.00   14.66   4.51
16:04:08 sdb              2.30    187.20    44.50  95.09   30.74    81.39   
6.80    345.20    79.70  92.14   29.72    50.76    0.00      0.00     0.00  
0.00    0.00     0.00    0.60   14.33    0.28   1.26
16:04:08 sdc              1.90    138.80    32.80  94.52   16.63    73.05   
6.60    295.60    67.50  91.09   13.06    44.79    0.00      0.00     0.00  
0.00    0.00     0.00    0.60   11.33    0.12   1.05
16:04:08 sdd              2.30    194.40    46.30  95.27    3.70    84.52   
2.90    138.80    32.00  91.69    3.34    47.86    0.00      0.00     0.00  
0.00    0.00     0.00    0.60    4.67    0.02   0.54
16:04:08 sde              1.80    204.00    49.20  96.47   14.89   113.33   
4.10    302.40    71.70  94.59   13.27    73.76    0.00      0.00     0.00  
0.00    0.00     0.00    0.60    6.17    0.08   1.66
16:04:08 sdf              1.90     97.20    22.40  92.18   14.63    51.16   
4.70    212.00    48.50  91.17   19.70    45.11    0.00      0.00     0.00  
0.00    0.00     0.00    0.60   11.50    0.13   1.98
16:04:08 sdg              2.00    212.00    51.00  96.23    7.80   106.00   
4.70    279.20    65.30  93.29    8.32    59.40    0.00      0.00     0.00  
0.00    0.00     0.00    0.60    8.00    0.06   1.86
16:04:08 sdh              2.20    213.20    51.10  95.87   21.73    96.91   
4.80    315.60    74.30  93.93   27.77    65.75    0.00      0.00     0.00  
0.00    0.00     0.00    0.60   14.33    0.19   2.05

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