Re: [PATCH] sched/fair: Correct CPU selection from isolated domain

[Greg KH]

On Mon, Jan 06, 2025 at 05:26:34PM +0800, wujing wrote:
> From: wujing <realwujing@xxxxxxxxx>
> 
> We encountered an issue where the kernel thread `ksmd` runs on the PMD
> dedicated isolated core, leading to high latency in OVS packets.
> 
> Upon analysis, we discovered that this is caused by the current
> select_idle_smt() function not taking the sched_domain mask into account.
> 
> Kernel version: linux-4.19.y

You do know that 4.19.y is long end-of-life and totally insecure and
nothing that you should be using in anything, right?  Please move to a
more modern kernel version.

good luck!

greg k-h