Can I use main lcore as a worker core?

Can I use main lcore as a worker core?

[Antonio Di Bacco]

When I instantiate a process with 4 cores, I have 3 worker cores and
one main lcore.

I'm wasting an isolated core (the main lcore) to do nothing.

I want to overcome this and use also the main lcore.

Best regards,
Anna.

Re: Can I use main lcore as a worker core?

[Rajesh Kumar]

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If that is what you wanted, then create 2 lcore on first physical core.

--lcores (0-1)@0,2@1,3@2,4@3

in short, you are running lcore 0,1 in physical-core 0, lcore 2 in
physical-core 1, etc.,

Thanks,
*-Rajesh*


On Tue, Mar 18, 2025 at 8:08 PM Antonio Di Bacco <a.dibacco.ks@gmail.com>
wrote:

> When I instantiate a process with 4 cores, I have 3 worker cores and
> one main lcore.
>
> I'm wasting an isolated core (the main lcore) to do nothing.
>
> I want to overcome this and use also the main lcore.
>
> Best regards,
> Anna.
>

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Re: Can I use main lcore as a worker core?

[Stephen Hemminger]

On Tue, 18 Mar 2025 15:38:31 +0100
Antonio Di Bacco <a.dibacco.ks@gmail.com> wrote:

> When I instantiate a process with 4 cores, I have 3 worker cores and
> one main lcore.
> 
> I'm wasting an isolated core (the main lcore) to do nothing.
> 
> I want to overcome this and use also the main lcore.
> 
> Best regards,
> Anna.

It is often useful to main lcore on non-isolated CPU and have it available
for application control tasks. I.e Don't use it for polling instead block
on epoll etc.