Re: [PATCH] ext4: rralloc - (former rotalloc) improved round-robin allocation policy

[Theodore Tso]

On Fri, Feb 27, 2026 at 03:46:59PM +0100, Mario Lohajner wrote:
> 
> Concentrated allocation can create contention, write amplification, and
> uneven LBA utilization even on modern NVMe/SSD devices.

Uneven LBA utilization is the thing where I'm asking, "why should we care".

In terms of how this would cause contention and write amplification,
<<citation needed>>.  What is your benchmarks where you can
demonstrate this, and how common is this across NVMe/SSD devices?
That is, if it's just one trashy product, maybe it should just be
avoided --- especially if it has other problems.

						- Ted