Re: Filesystem writes on RAID5 too slow

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

> xfs: align initial file allocations correctly.
> 
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> 
> The function xfs_bmap_isaeof() is used to indicate that an
> allocation is occurring at or past the end of file, and as such
> should be aligned to the underlying storage geometry if possible.
> 
> Commit 27a3f8f ("xfs: introduce xfs_bmap_last_extent") changed the
> behaviour of this function for empty files - it turned off
> allocation alignment for this case accidentally. Hence large initial
> allocations from direct IO are not getting correctly aligned to the
> underlying geometry, and that is cause write performance to drop in
> alignment sensitive configurations.
> 
> Fix it by considering allocation into empty files as requiring
> aligned allocation again.

Seems like this one didn't get picked up yet?