Re: [dpdk-dev] [PATCH] eal: restrict ctrl threads to startup cpu affinity

[David Marchand <david.marchand@redhat.com>]

On Thu, Feb 14, 2019 at 11:05 AM Burakov, Anatoly <anatoly.burakov@intel.com>
wrote:

> On 14-Feb-19 9:53 AM, David Marchand wrote:
>
> > A bit more context then, if you want to clearly pin cpu resources for
> > the processes on your system (let's say having virtual machines and a
> > popular vswitch), I can only think of two solutions.
> > Either you have something to configure your processes to have them call
> > sched_setaffinity/pthread_set_affinity_np, or you use taskset to get
> > them "jailed" without them caring.
> >
> > Before the incriminated commit, we were keeping all threads on the
> > coremask that had been passed, but as Olivier said, we would end up with
> > ctrl threads spanwed on core running dataplane threads as well.
> >
> > Now, the ctrl threads can be spawned anywhere on all & ~coremask, with
> > no way to configure this.
> > I considered adding a new eal option, but I think relying on the current
> > cpu affinity is a better default behavior and I can't see drawbacks at
> > the moment.
>
> OK, that makes sense. However, i feel this behavior (both old and new,
> for that matter) should be better documented somewhere in the EAL docs.
>
>
I'll see what I can add in the doc for v2.


-- 
David Marchand