From mboxrd@z Thu Jan  1 00:00:00 1970
From: Shirley Avishour <shirley@imvisiontech.com>
Subject: Re: running dpdk application on the same machine with
 other none dpdk application
Date: Wed, 30 Jan 2019 10:27:31 +0200
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To: Rami Rosen <ramirose@gmail.com>
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Hi Rami,
This is correct but that is because the default value of the PF_NO_SETAFFINITY
flags does not allow to set affinity to kernel threads from user space.
I was looking for a way to change the kernel and recompile it to be able to
block kernel threads from running on the cpu isolated cores. (same as user
space threads).

BR,
Shirley.



On Wed, Jan 30, 2019 at 10:18 AM Rami Rosen <ramirose@gmail.com> wrote:

> Hi Shirley,
>
> > Do you know if the PF_NO_SETAFFINITY flag can help in any way?
>
> AFAIK, this will not work for kernel thread.
>
> For example, with 4.8.13-1 kernel:
> Display all kernel threads with
> ps aux | grep "\["n
>
> (as kernel threads are enclosed in square brackets, [ ])
> And pick one of them and try:
> taskset -pc 7 521
> pid 521's current affinity list: 0-15
> taskset: failed to set pid 521's affinity: Invalid argument
> Regards,
> Rami Rosen
>
>