From: David Marchand <david.marchand@redhat.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.com>
Cc: dev@dpdk.org, Olivier Matz <olivier.matz@6wind.com>,
Kevin Traynor <ktraynor@redhat.com>,
dpdk stable <stable@dpdk.org>
Subject: Re: [dpdk-stable] [PATCH] eal: restrict ctrl threads to startup cpu affinity
Date: Thu, 14 Feb 2019 11:16:27 +0100 [thread overview]
Message-ID: <CAJFAV8z6bND+8gy7uTFNvW2FvYn_Ag6Yjc+sacq_ok7Sb58pLQ@mail.gmail.com> (raw)
In-Reply-To: <4304821e-dd76-da80-2dec-e1c540e95ea5@intel.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
next prev parent reply other threads:[~2019-02-14 10:16 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-13 16:13 David Marchand
2019-02-13 20:21 ` [dpdk-stable] [dpdk-dev] " David Marchand
2019-02-14 9:39 ` [dpdk-stable] " Burakov, Anatoly
2019-02-14 9:53 ` David Marchand
2019-02-14 10:04 ` Burakov, Anatoly
2019-02-14 10:16 ` David Marchand [this message]
2019-02-14 11:05 ` [dpdk-stable] [dpdk-dev] " David Marchand
2019-02-14 13:30 ` [dpdk-stable] [PATCH v2 1/2] eal: fix potential incorrect pinning for ctrl threads David Marchand
2019-02-14 13:30 ` [dpdk-stable] [PATCH v2 2/2] eal: restrict ctrl threads to startup cpu affinity David Marchand
2019-02-19 11:38 ` Burakov, Anatoly
2019-02-19 11:51 ` David Marchand
2019-02-19 16:03 ` Thomas Monjalon
2019-02-14 16:12 ` [dpdk-stable] [PATCH v2 1/2] eal: fix potential incorrect pinning for ctrl threads Burakov, Anatoly
2019-02-14 17:45 ` David Marchand
2019-02-19 20:41 ` [dpdk-stable] [PATCH v3 " David Marchand
2019-02-19 20:41 ` [dpdk-stable] [PATCH v3 2/2] eal: restrict ctrl threads to startup cpu affinity David Marchand
2019-02-20 16:01 ` Burakov, Anatoly
2019-02-25 8:33 ` Olivier Matz
2019-03-07 18:23 ` [dpdk-stable] [dpdk-dev] " Thomas Monjalon
2019-02-20 16:01 ` [dpdk-stable] [PATCH v3 1/2] eal: fix potential incorrect pinning for ctrl threads Burakov, Anatoly
2019-02-25 8:33 ` Olivier Matz
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