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From: Bruce Richardson <bruce.richardson@intel.com>
To: Jerin Jacob <jerinjacobk@gmail.com>
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Subject: Re: [dpdk-dev] [RFC] DPDK Trace support
Date: Mon, 13 Jan 2020 16:12:59 +0000	[thread overview]
Message-ID: <20200113161259.GE1645@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <CALBAE1MaEp8uGSGx-UsP5WOcyConE2JpDznEtycA4ZsaHPtWzg@mail.gmail.com>

On Mon, Jan 13, 2020 at 08:43:01PM +0530, Jerin Jacob wrote:
> On Mon, Jan 13, 2020 at 8:28 PM Bruce Richardson
> <bruce.richardson@intel.com> wrote:
> >
> > On Mon, Jan 13, 2020 at 08:16:07PM +0530, Jerin Jacob wrote:
> > > On Mon, Jan 13, 2020 at 6:36 PM Bruce Richardson
> > > <bruce.richardson@intel.com> wrote:
> > > >
> > > >
> > > > > So, Probably it good to have native CTF emitter in DPDK and reuse all
> > > > > open-source trace viewer(babeltrace and  TraceCompass) and format(CTF) infrastructure.
> > > > > I think, it would be best of both world.
> > > > >
> > > > > Any thoughts on this subject? Based on the community feedback, I can work on the patch for v20.05.
> > > >
> > > > Forgive my ignorance of LTTng, but is there the concept of
> > > > enabling/disabling the trace points? If so, the overhead you refer to, that
> > > > is presumably with the trace enabled?
> > >
> > > Yes this is when trace is enabled. If the trace is disabled then it
> > > will be the only a handful of cycles.
> > >
> > Two follow-on questions:
> > 1. Is the trace enable/disable dynamic at runtime?
> 
> Yes. See the requirement section.
> 
> > 2. Have you investigated how low the "handful of cycles" actually is?
> 
> Yes. it is around 1 to 3 cycles based on the arch. it boils down to
> mostly a branch hit/miss on a memory location
> embedded in a C macro.
> 
That seems impressively low, which is great news!

/Bruce

  reply	other threads:[~2020-01-13 16:13 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-13 10:40 [dpdk-dev] [RFC] DPDK Trace support Jerin Jacob Kollanukkaran
2020-01-13 11:00 ` Ray Kinsella
2020-01-13 12:04   ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2020-01-18 15:14   ` [dpdk-dev] " dave
2020-01-20 16:51     ` Stephen Hemminger
2020-01-13 13:05 ` Bruce Richardson
2020-01-13 14:46   ` Jerin Jacob
2020-01-13 14:58     ` Bruce Richardson
2020-01-13 15:13       ` Jerin Jacob
2020-01-13 16:12         ` Bruce Richardson [this message]
2020-01-17  4:41           ` Jerin Jacob
2020-01-17  8:04             ` David Marchand
2020-01-17  9:52               ` Jerin Jacob
2020-01-17 10:30                 ` Mattias Rönnblom
2020-01-17 10:54                   ` Jerin Jacob
2020-02-15 10:21                     ` Jerin Jacob
2020-02-17  9:35                       ` Mattias Rönnblom
2020-02-17 10:23                         ` Jerin Jacob
2020-01-17 10:43                 ` David Marchand
2020-01-17 11:08                   ` Jerin Jacob
2020-01-27 16:12 ` Aaron Conole
2020-01-27 17:23   ` Jerin Jacob
2020-01-20  4:48 Jerin Jacob Kollanukkaran
2020-01-20 12:08 ` Ray Kinsella

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