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List:       fedora-devel-list
Subject:    Re: btrfs hash algorithm (should xxhash be the default?)
From:       Chris Murphy <lists () colorremedies ! com>
Date:       2021-02-02 15:33:39
Message-ID: CAJCQCtQxoeExueXLKEaKb5a=4xQ5WBywuSdvCJhjsMTzMjiZZw () mail ! gmail ! com
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On Mon, Feb 1, 2021 at 2:01 PM Chris Murphy <lists@colorremedies.com> wrote:
>
> I'm seeing:
>
> [    1.179693] Btrfs loaded, crc32c=crc32c-generic, zoned=yes
>
> Someone adventurous might want to figure out how to get it to use
> crc32c_intel instead.

Ignore the above.

As it turns out crc32c-generic is built into the kernel, crc32c-intel
is built as a module. Btrfs initially is using generic, but switches
to intel once it's available.

cat /sys/fs/btrfs/$FSUUID/checksum/
crc32c (crc32c-intel)

Where $FSUUID is the UUID for the Btrfs file system you're inquiring
about; lsblk -f or blkid.

-- 
Chris Murphy
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