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sdauth
l33t
Joined: 19 Sep 2018
Posts: 650
Location: Ásgarðr
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 Posted: Thu Jun 06, 2024 2:46 am Post subject: btrfs commit interval set to wrong value |
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Hello,
Just noticed this warning in my dmesg while compiling stuff :
| Code: | [ 4078.393991] BTRFS warning (device dm-0: state M): excessive commit interval 600
[ 4078.588846] BTRFS warning (device dm-0: state M): excessive commit interval 600
[ 4078.715846] BTRFS warning (device dm-0: state M): excessive commit interval 600
[ 4078.812318] BTRFS warning (device dm-1: state M): excessive commit interval 600
[ 4078.893969] BTRFS warning (device dm-1: state M): excessive commit interval 600
[ 6752.596126] NMI watchdog: Enabled. Permanently consumes one hw-PMU counter.
[ 6753.004148] BTRFS info (device dm-0: state M): using default commit interval 30s
[ 6753.202759] BTRFS info (device dm-0: state M): using default commit interval 30s
[ 6753.421820] BTRFS info (device dm-0: state M): using default commit interval 30s
[ 6753.603365] BTRFS info (device dm-1: state M): using default commit interval 30s
[ 6753.722112] BTRFS info (device dm-1: state M): using default commit interval 30s |
the mount command returns :
| Code: | | /dev/mapper/enc_root on / type btrfs (rw,relatime,ssd,discard=async,space_cache=v2,commit=600,subvolid=544,subvol=/gentoo_musl) |
fstab :
| Code: | UUID=496895b2-9e66-4a7c-8824-8f79074d200a / btrfs defaults,subvol=gentoo_musl 0 0
UUID=496895b2-9e66-4a7c-8824-8f79074d200a /swap btrfs defaults,subvol=swap 0 0
/swap/swapfile none swap defaults 0 0 |
Why does the mount command return commit=600 ? As you can see, commit variable is not set in fstab, so why is it not using the default 30s value ?
Thanks
PS : kernel 6.6.30 / gentoo musl hardened |
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sdauth
l33t
Joined: 19 Sep 2018
Posts: 650
Location: Ásgarðr
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| Posted: Thu Jun 06, 2024 5:12 pm Post subject: |
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This is strange, when I start the system and runs mount command, the commit variable doesn't appear. (default value is used, all good)
| Code: | | /dev/mapper/enc_root on / type btrfs (rw,relatime,ssd,discard=async,space_cache=v2,subvolid=544,subvol=/gentoo_musl) |
But when the system is under heavy load (with lot of writes), then "excessive commit interval" warning is triggered :
| Code: | | BTRFS warning (device dm-0: state M): excessive commit interval 600 |
then fallback to default
| Code: | | BTRFS info (device dm-0: state M): using default commit interval 30s |
How is it possible ? Legit bug ?
I ran a scrub on the btrfs fs, no issue. |
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