Re: [PATCH v2 00/16] Parallelizing filesystem writeback

Christoph Hellwig
2025-10-29T08:55:32Z

On Tue, Oct 28, 2025 at 11:09:32PM -0700, Darrick J. Wong wrote:
> Was that with or without rtgroups? metadir/rtgroups aren't enabled by
> default yet so you'd have to select that manually with mkfs.xfs -m
> metadir=1.
>
> (and you might still not see much change because of what hch said)

The real problem here is that even the inode number to AG association
is just a hint, and will often go wrong on an aged file system.

Now for the zoned RT device we could probably do a thread per open
zone, as that is a very logical association. The problem with that
right now is that we only pick the zone to write to once doing
writeback, but there might be ways to lift it up. Then again
zoned writeback is so little code that I can't see how it would
saturate a single thread.

>
> --D
---end quoted text---