Re: quick question about core affinity

["Lukáš Šišmiš" <sismis@cesnet.cz>]

Hi,


DPDK core affinity runs your application on the selected cores. But that 
doesn't stop other applications from running on the same cores.

To get closer to your goal of really isolating the application from 
other processes you would need to add isolcpus to your boot parameters.

That instructs the scheduler to not use the mentioned cores. After 
booting with this parameter you could run your DPDK application and 
scheduler would not schedule any process to the cores that DPDK 
application would use.

However, if you run a separate application and with the taskset command 
pin it to the cores your DPDK application uses that will still run and 
will be in conflict with your DPDK app.


Best regards,

Lukas

On 26. 04. 23 13:37, 이재홍 wrote:
> Hello, I'm new to DPDK
>
> I've tried to run samples and got a query about core affinity.
> As I understand, if a lcore has affinity to a CPU set, it will run 
> only on the CPU set.
> And I thought If I run a dpdk sample with core 0-2, none process can 
> use the core (0-2). but when I try to run a simple app(not dpdk app) 
> with taskset command, it runs on 0, 1, 2 cores..
>
> what I want was if I use cores for dpdk apps none other process can 
> access the cores.. but it seems possible..
>
> I've googled to find out this but I couldn't find anything I wanted.
> Is there anyone can explain about this...?
>
>
> BR.
> Jaehong Lee