[PATCHv2 0/2] block,nvme: latency-based I/O scheduler

[Keith Busch]

On Wed, Apr 03, 2024 at 04:17:54PM +0200, Hannes Reinecke wrote:
> Hi all,
> 
> there had been several attempts to implement a latency-based I/O
> scheduler for native nvme multipath, all of which had its issues.
> 
> So time to start afresh, this time using the QoS framework
> already present in the block layer.
> It consists of two parts:
> - a new 'blk-nlatency' QoS module, which is just a simple per-node
>   latency tracker
> - a 'latency' nvme I/O policy
 
Whatever happened with the io-depth based path selector? That should
naturally align with the lower latency path, and that metric is cheaper
to track.