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

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Date: Sat, 23 Dec 2023 15:47:13 +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 #51 from carlos@...ica.ufpr.br ---
bugzilla-daemon@...nel.org (bugzilla-daemon@...nel.org) wrote on Fri, Dec 22,
2023 at 10:48:39PM -03:
> https://bugzilla.kernel.org/show_bug.cgi?id=217965
> 
> Andreas Dilger (adilger.kernelbugzilla@...ger.ca) changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>                  CC|                            |adilger.kernelbugzilla@...g
>                    |                            |er.ca
> 
> --- Comment #48 from Andreas Dilger (adilger.kernelbugzilla@...ger.ca) ---
> Independent of the fixes to the mballoc code to improve the allocation
> performance, I'm wondering about the ''RAID stride'' values in use here.
> The "stride" value is intended to be the size of one complete set of
> disks (e.g. 128KiB chunk size * 8 data disks = 1MiB).  The filesystem
> doesn't see the parity disks, so the number of those disks does not
> matter to ext4. 
> 
> It seems in all these cases that the stripe/stride is strange.  I can't
> see any value to setting stride to (almost) 128MB, especially not on a
> RAID-1 system.   Were these values automatically generated by mke2fs,
> or entered manually?  If manually, why was that value chosen?   If there
> is something unclear in the documentation it should be fixed, and the
> same if there is something wrong in mke2fs detection of the geometry.
> 
>     > By default the FS is mounted with stripe=1280 because it's on a raid6.
>     > Remounting with stripe=0 works around the problem. Excellent!
> 
> Carlos, how many data disks in this system?  Do you have 5x 256KiB or
> 10x 128KiB *data* disks, plus 2 *parity* disks?

There are 10 data disks. The stride, determined automatically by mke2fs, is
correct since the chunk is 512KiB.

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