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From: David Marchand <david.marchand@redhat.com>
To: Jerin Jacob <jerinjacobk@gmail.com>
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Subject: Re: [dpdk-dev] [RFC] DPDK Trace support
Date: Fri, 17 Jan 2020 09:04:49 +0100	[thread overview]
Message-ID: <CAJFAV8y-nbJTz3o6ipz76fKg7417NqESxvrVEWPs+vEkyeLHTQ@mail.gmail.com> (raw)
In-Reply-To: <CALBAE1PcVvGa3e2HSUM4iVgO6pRnhv14rSW-R0RmoDStgoLC-g@mail.gmail.com>

On Fri, Jan 17, 2020 at 5:41 AM Jerin Jacob <jerinjacobk@gmail.com> wrote:
>
> > > > >
> > > > > 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!
>
> Does anyone have an objection to have
> 1) Use CTF as trace format to reuse the opensource tracing tools and
> compatibility wth LTTng
> https://diamon.org/ctf/
> 2) Have native DPDK CTF trace emitter for better performance for DPDK
> fast path tracing and Non-Linux support.
>
> I would like to avoid the situation where once code gets completed and
> then starts our basic discussion
> on the design decisions.
>
> If someone needs more time to think through or any clarification is
> required then please discuss.

I did not find the time to look at this.
Some quick questions:
- is LTTng coming with out-of-tree kmod? making it hard to support in
distributions?
- I have been playing with perf those days to track live processes and
gathering informations/stats at key point of a dpdk app without adding
anything in the binary. What does LTTng provide that scripting around
perf would not solve?


-- 
David Marchand


  reply	other threads:[~2020-01-17  8:05 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-13 10:40 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
2020-01-17  4:41           ` Jerin Jacob
2020-01-17  8:04             ` David Marchand [this message]
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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