Feature Request: P40 KV Tail optimization

[simcop2387]

Prerequisites

• I am running the latest code. Mention the version if possible as well.
• I carefully followed the README.md.
• I searched using keywords relevant to my issue to make sure that I am creating a new issue that is not already open (or closed).
• I reviewed the Discussions, and have a new and useful enhancement to share.

Feature Description

So on P40 gpus right now kv tail doesn't work because of some unsupported ops.

0.04.306.042 E llama_init_from_model: failed to initialize the context: KV tail layer 3 native operation is unsupported by its planned backend CUDA0; refusing scheduler fallback

I don't know enough myself on how all that works but I'd love to have that available for these older gpus for some better performance for tasks that don't quite otherwise fit.

Motivation

Wider GPU support for some older but still useful gpus

Possible Implementation

No response

[simcop2387]

I consider this a bit of a longshot ask given the lower capability of these gpus as far as cuda ops goes, so completely understand if it's just not reasonable to do because of those limits.