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From: Jerin Jacob Kollanukkaran <jerinj@marvell.com>
To: "dev@dpdk.org" <dev@dpdk.org>
Cc: "Thomas Monjalon" <thomas@monjalon.net>,
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	"Declan Doherty" <declan.doherty@intel.com>,
	"Pablo de Lara" <pablo.de.lara.guarch@intel.com>,
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	"Jingjing Wu" <jingjing.wu@intel.com>,
	"Bernard Iremonger" <bernard.iremonger@intel.com>,
	"Declan Doherty" <declan.doherty@intel.com>,
	"Jerin Jacob Kollanukkaran" <jerinj@marvell.com>,
	"Maryam Tahhan" <maryam.tahhan@intel.com>,
	"Reshma Pattan" <reshma.pattan@intel.com>,
	"Marko Kovacevic" <marko.kovacevic@intel.com>,
	"Ori Kam" <orika@mellanox.com>,
	"Bruce Richardson" <bruce.richardson@intel.com>,
	"Radu Nicolau" <radu.nicolau@intel.com>,
	"Akhil Goyal" <akhil.goyal@nxp.com>,
	"Bruce Richardson" <bruce.richardson@intel.com>,
	"Tomasz Kantecki" <tomasz.kantecki@intel.com>,
	"Sunil Kumar Kori" <skori@marvell.com>,
	"Pavan Nikhilesh Bhagavatula" <pbhagavatula@marvell.com>,
	"John McNamara" <john.mcnamara@intel.com>,
	"Kirill Rybalchenko" <kirill.rybalchenko@intel.com>,
	"Bruce Richardson" <bruce.richardson@intel.com>,
	"John McNamara" <john.mcnamara@intel.com>,
	"Harry van Haaren" <harry.van.haaren@intel.com>,
	"Bruce Richardson" <bruce.richardson@intel.com>,
	"John McNamara" <john.mcnamara@intel.com>,
	"Xiaoyun Li" <xiaoyun.li@intel.com>,
	"Prasun Kapoor" <pkapoor@marvell.com>,
	"Keith Wiles" <keith.wiles@intel.com>,
	"Kadam, Pallavi" <pallavi.kadam@intel.com>
Subject: [dpdk-dev] [RFC]  DPDK Trace support
Date: Mon, 13 Jan 2020 10:40:13 +0000
Message-ID: <BYAPR18MB2424BF2CAD9AFE5F1C3755F0C8350@BYAPR18MB2424.namprd18.prod.outlook.com> (raw)

Hi All,

I would like to add tracing support for DPDK.
I am planning to add this support in v20.05 release.

This RFC attempts to get feedback from the community on

a) Tracing Use cases.
b) Tracing Requirements.
b) Implementation choices.
c) Trace format.

Use-cases
---------
- Most of the cases, The DPDK provider will not have access to the DPDK customer applications.
To debug/analyze the slow path and fast path DPDK API usage from the field,
we need to have integrated trace support in DPDK.

- Need a low overhead Fast path multi-core PMD driver debugging/analysis
infrastructure in DPDK to fix the functional and performance issue(s) of PMD.

- Post trace analysis tools can provide various status across the system such
as cpu_idle() using the timestamp added in the trace.


Requirements:
-------------
- Support for Linux, FreeBSD and Windows OS
- Open trace format
- Multi-platform Open source trace viewer
- Absolute low overhead trace API for DPDK fast path tracing/debugging.
- Dynamic enable/disable of trace events


To enable trace support in DPDK, following items need to work out: 

a) Add the DPDK trace points in the DPDK source code.

- This includes updating DPDK functions such as,
rte_eth_dev_configure(), rte_eth_dev_start(), rte_eth_dev_rx_burst() to emit the trace.

b) Choosing suitable serialization-format

- Common Trace Format, CTF, is an open format and language to describe trace formats.
This enables tool reuse, of which line-textual (babeltrace) and 
graphical (TraceCompass) variants already exist.

CTF should look familiar to C programmers but adds stronger typing. 
See CTF - A Flexible, High-performance Binary Trace Format.

https://diamon.org/ctf/

c) Writing the on-target serialization code,

See the section below.(Lttng CTF trace emitter vs DPDK specific CTF trace emitter)
 
d) Deciding on and writing the I/O transport mechanics,

For performance reasons, it should be backed by a huge-page and write to file IO.

e) Writing the PC-side deserializer/parser,

Both the babletrace(CLI tool) and Trace Compass(GUI tool) support CTF.
See: 
https://lttng.org/viewers/

f) Writing tools for filtering and presentation.

See item (e)


Lttng CTF trace emitter vs DPDK specific CTF trace emitter
----------------------------------------------------------

I have written a performance evaluation application to measure the overhead
of Lttng CTF emitter(The fastpath infrastructure used by https://lttng.org/ library to emit the trace)

https://github.com/jerinjacobk/lttng-overhead
https://github.com/jerinjacobk/lttng-overhead/blob/master/README

I could improve the performance by 30% by adding the "DPDK"
based plugin for get_clock() and get_cpu(),
Here are the performance numbers after adding the plugin on 
x86 and various arm64 board that I have access to,

On high-end x86, it comes around 236 cycles/~100ns @ 2.4GHz (See the last line in the log(ZERO_ARG)) 
On arm64, it varies from 312 cycles to 1100 cycles(based on the class of CPU).
In short, Based on the "IPC capabilities", The cost would be around 100ns to 400ns
for single void trace(a trace without any argument)


[lttng-overhead-x86] $ sudo ./calibrate/build/app/calibrate -c 0xc0
make[1]: Entering directory '/export/lttng-overhead-x86/calibrate'
make[1]: Leaving directory '/export/lttng-overhead-x86/calibrate'
EAL: Detected 56 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: Probing VFIO support...
EAL: PCI device 0000:01:00.0 on NUMA socket 0
EAL:   probe driver: 8086:1521 net_e1000_igb
EAL: PCI device 0000:01:00.1 on NUMA socket 0
EAL:   probe driver: 8086:1521 net_e1000_igb
CPU Timer freq is 2600.000000MHz
NOP: cycles=0.194834 ns=0.074936
GET_CLOCK: cycles=47.854658 ns=18.405638
GET_CPU: cycles=30.995892 ns=11.921497
ZERO_ARG: cycles=236.945113 ns=91.132736


We will have only 16.75ns to process 59.2 mpps(40Gbps), So IMO, Lttng CTF emitter
may not fit the DPDK fast path purpose due to the cost associated with generic Lttng features.

One option could be to have, native CTF emitter in EAL/DPDK to emit the
trace in a hugepage. I think it would be a handful of cycles if we limit the features
to the requirements above:

The upside of using Lttng CTF emitter:
a) No need to write a new CTF trace emitter(the item (c))

The downside of Lttng CTF emitter(the item (c))
a) performance issue(See above)
b) Lack of Windows OS support. It looks like, it has basic FreeBSD support.
c) dpdk library dependency to lttng for trace.

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.

             reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-13 10:40 Jerin Jacob Kollanukkaran [this message]
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
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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