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From: Jerin Jacob <jerinjacobk@gmail.com>
To: Venky Venkatesh <vvenkatesh@paloaltonetworks.com>
Cc: "Mattias Rönnblom" <mattias.ronnblom@ericsson.com>,
	"Jerin Jacob" <jerinj@marvell.com>, dpdk-dev <dev@dpdk.org>,
	"dpdk stable" <stable@dpdk.org>
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] event/dsw: avoid reusing previously recorded events
Date: Sat, 4 Apr 2020 18:05:02 +0530	[thread overview]
Message-ID: <CALBAE1P0Tkf2yk=7sD7PGBjoWYS21aBwt0WDcQo71ZqihtywNQ@mail.gmail.com> (raw)
In-Reply-To: <CAJ4WCtLbtuVkjqqod+HRc1PxRwFuxzTLRE3AgL_RL-Hu3C8JOg@mail.gmail.com>

On Fri, Mar 6, 2020 at 11:35 AM Venky Venkatesh
<vvenkatesh@paloaltonetworks.com> wrote:
>
> Hi Mattias,
> Have a question on this fix. I understand you wanting a certain number of
> events before making a decision to migrate (in the above fix).
> However, suppose there are fewer events over a few flows (even if not many)
> and yet your core is heavily loaded -- indicating may be they are one or
> more very CPU intensive flows. Often in DPI situations depending on the
> complexity of the policy you can get delayed longer. It might still be
> worthwhile to migrate if the other cores are really lightly loaded. I think
> that case will be missed out in this approach.
>
> Fundamentally, the number of packets being a proxy-metric for the load of
> that flow on the cpu is simplistic at times. Very CPU intensive
> medium/lower bandwidth flows can be picked up in this heuristic. If there
> is a way that at the time of DSW init we can have a way of tuning it
> depending on the application scenario it might be more flexible.

Hi Venky and Mattias,

Is this patch to good to merge?

>
> Thanks
> -Venky
>
>
> On Thu, Mar 5, 2020 at 2:47 AM Mattias Rönnblom <
> mattias.ronnblom@ericsson.com> wrote:
>
> > Avoid reusing recorded events when performing a migration, since this
> > may make the migration selection logic pick an already-moved flow.
> >
> > Fixes: f6257b22e767 ("event/dsw: add load balancing")
> > Cc: stable@dpdk.org
> >
> > Reported-by: Venky Venkatesh <vvenkatesh@paloaltonetworks.com>
> > Signed-off-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>
> > ---
> >  drivers/event/dsw/dsw_event.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/event/dsw/dsw_event.c b/drivers/event/dsw/dsw_event.c
> > index d68b71b98..296adea18 100644
> > --- a/drivers/event/dsw/dsw_event.c
> > +++ b/drivers/event/dsw/dsw_event.c
> > @@ -646,6 +646,9 @@ dsw_port_consider_migration(struct dsw_evdev *dsw,
> >         if (dsw->num_ports == 1)
> >                 return;
> >
> > +       if (seen_events_len < DSW_MAX_EVENTS_RECORDED)
> > +               return;
> > +
> >         DSW_LOG_DP_PORT(DEBUG, source_port->id, "Considering
> > migration.\n");
> >
> >         /* Randomize interval to avoid having all threads considering
> > --
> > 2.17.1
> >
> >

  parent reply	other threads:[~2020-04-04 12:35 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-05 10:46 [dpdk-stable] " Mattias Rönnblom
2020-03-06  6:05 ` Venky Venkatesh
2020-03-06  7:48   ` Mattias Rönnblom
2020-04-04 12:35   ` Jerin Jacob [this message]
2020-04-14 12:45     ` [dpdk-stable] [dpdk-dev] " Jerin Jacob
2020-04-14 13:11       ` Mattias Rönnblom
2020-04-14 13:32         ` Jerin Jacob
2020-05-01  8:01           ` Jerin Jacob

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