[OpenIndiana-discuss] OI on modern Intel with P-cores and E-cores?

[Tim Mooney]

In regard to: Re: [OpenIndiana-discuss] OI on modern Intel with P-cores and...:

> With respect to Intel systems with a mix of P and E cores, I have a
> system with an i5-1235U ("12th generation Alder Lake" which is I think
> ~2 generations older than "Arrow Lake").   It's behaving itself with all
> cores running (2 P cores, 8 E cores), acting primarily as a router, dhcp
> server, and dns resolver:

Thanks Bill!

I really appreciate the response.

Have you run into any situations that you could identify where you
think it would be (or would have been) useful to force certain processes
onto certain cores?  Or has the experience been good enough that it hasn't
been worth investigating?

> My understanding is that the illumos scheduler isn't following best
> practices for P vs E (which is to first use first thread of P cores,
> then E cores, then the 2nd thread of P cores), but it also looks like
> intel is no longer offering hyperthreaded P cores in Arrow Lake.

That's correct, hyperthreading is no more.

> So it should work but may not perform as well as it could with a bit more 
> intelligence in the scheduler.

Thanks again for the response,

Tim
-- 
Tim Mooney                                             Tim.Mooney at ndsu.edu
Enterprise Computing & Infrastructure /
Division of Information Technology    /                701-231-1076 (Voice)
North Dakota State University, Fargo, ND 58105-5164