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USENIX ATC 2017 Performance Superpowers with Enhanced BPF

Brendan Gregg
Brendan Gregg
Brendan GreggSenior Performance Architect at Netflix

Talk for USENIX ATC 2017 by Brendan Gregg "The Berkeley Packet Filter (BPF) in Linux has been enhanced in very recent versions to do much more than just filter packets, and has become a hot area of operating systems innovation, with much more yet to be discovered. BPF is a sandboxed virtual machine that runs user-level defined programs in kernel context, and is part of many kernels. The Linux enhancements allow it to run custom programs on other events, including kernel- and user-level dynamic tracing (kprobes and uprobes), static tracing (tracepoints), and hardware events. This is finding uses for the generation of new performance analysis tools, network acceleration technologies, and security intrusion detection systems. This talk will explain the BPF enhancements, then discuss the new performance observability tools that are in use and being created, especially from the BPF compiler collection (bcc) open source project. These tools provide new insights for file system and storage performance, CPU scheduler performance, TCP performance, and much more. This is a major turning point for Linux systems engineering, as custom advanced performance instrumentation can be used safely in production environments, powering a new generation of tools and visualizations. Because these BPF enhancements are only in very recent Linux (such as Linux 4.9), most companies are not yet running new enough kernels to be exploring BPF yet. This will change in the next year or two, as companies including Netflix upgrade their kernels. This talk will give you a head start on this growing technology, and also discuss areas of future work and unsolved problems."

USENIX ATC 2017 Performance Superpowers with Enhanced BPF

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Performance Analysis Superpowers with Linux eBPF
Brendan Gregg
Senior Performance Architect
Jul 2017
2017 USENIX Annual Technical Conference
USENIX ATC 2017 Performance Superpowers with Enhanced BPF
Efficiently	trace	TCP	sessions	with	PID,	bytes,	and	dura:on	using	tcplife
# /usr/share/bcc/tools/tcplife
PID COMM LADDR LPORT RADDR RPORT TX_KB RX_KB MS
2509 java 100.82.34.63 8078 100.82.130.159 12410 0 0 5.44
2509 java 100.82.34.63 8078 100.82.78.215 55564 0 0 135.32
2509 java 100.82.34.63 60778 100.82.207.252 7001 0 13 15126.87
2509 java 100.82.34.63 38884 100.82.208.178 7001 0 0 15568.25
2509 java 127.0.0.1 4243 127.0.0.1 42166 0 0 0.61
2509 java 127.0.0.1 42166 127.0.0.1 4243 0 0 0.67
12030 upload-mes 127.0.0.1 34020 127.0.0.1 8078 11 0 3.38
2509 java 127.0.0.1 8078 127.0.0.1 34020 0 11 3.41
12030 upload-mes 127.0.0.1 21196 127.0.0.1 7101 0 0 12.61
3964 mesos-slav 127.0.0.1 7101 127.0.0.1 21196 0 0 12.64
12021 upload-sys 127.0.0.1 34022 127.0.0.1 8078 372 0 15.28
2509 java 127.0.0.1 8078 127.0.0.1 34022 0 372 15.31
2235 dockerd 100.82.34.63 13730 100.82.136.233 7002 0 4 18.50
2235 dockerd 100.82.34.63 34314 100.82.64.53 7002 0 8 56.73
12068 titus-reap 127.0.0.1 46476 127.0.0.1 19609 0 0 1.25
[...]
bcc/BPF	tools
Agenda	
1.	eBPF	&	bcc	
2.	bcc/BPF	CLI	Tools	 3.	bcc/BPF	Visualiza?ons
Take	aways	
1.  Understand	Linux	tracing	components	
2.  Understand	the	role	and	state	of	enhanced	BPF	
3.  Discover	opportuni?es	for	future	development

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