On Mon, Feb 27, 2023 at 06:28:41PM +0100, Hannes Reinecke wrote: > On 2/27/23 17:33, Sagi Grimberg wrote: > > > > I'm not up to speed on how CDL is defined, but I'm unclear how CDL at > > the queue level would cause the host to open more queues? Because each CDL class would need its own submission queue in that scheme. They can all share a single completion queue, so this scheme doesn't necassarily increase the number of interrupt vectors. > > Another question, does CDL have any relationship with NVMe "Time Limited > > Error Recovery"? where the host can set a feature for timeout and > > indicate if the controller should respect it per command? > > > > While this is not a full-blown every queue/command has its own timeout, > > it could address the original use-case given by Hannes. And it's already > > there. > I guess that is the NVMe version of CDLs; can you give me a reference for > it? They're not the same. TLER starts timing after a command experiences a recoverable error, where CDL is an end-to-end timing for all commands.
