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LCU13: Tracing and Debugging for Networking Applications


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Resource: LCU13
Name: Tracking and Debugging for Networking Applications
Date: 29-10-2013
Speaker: Magnus Karlsson

Published in: Technology
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LCU13: Tracing and Debugging for Networking Applications

  1. 1. Tracing & Debugging for Networking Applications Magnus Karlsson, LSI
  2. 2. •  Networking is the application •  The networking app runs in user mode •  Special HW with highly integrated networking functions •  Lots of accelerators Application Domain Networking  Apps Linux Control   Apps Net stack CPU  0 CPU  1  –  CPU  N Networking Accelerators & HW Networking SoC User space Kernel space
  3. 3. •  Functionality for debugging and performance tuning of networking applications •  Reachable from user space •  Performance data and traces even from processing that does not touch cores. HW/SW implementation agnostic API •  Plug in architecture needed as each vendor’s HW is different •  Standard Linux interfaces o  CoreSight access library •  High resolution timers What is missing? Requirements
  4. 4. •  Ftrace •  LTTng •  Perf •  ftrace •  Uprobes •  Systemtap •  Ktap? •  GDB •  Cat /proc/* •  Etc… What to build on? Existing Linux Features
  5. 5. •  Access to CoreSight (access lib from ARM) •  Device driver for SW annotations to STM •  LTTng & ftrace writing to trace buffers (ETB) instead of file •  Decoding of ETB data through Linux (not DS-5). Open decoder needed •  GDB access to HW trace functionality •  Plugin of vendor’s accelerators into ftrace / LTTng •  Monitoring core isolation disturbances •  What about scalability? •  Feature uplift to x86 level? What functionality to target? •  What does ODP need? What more to add? What Functionality to Add?
  6. 6. •  For many people looking at this, English may be their second, third or fourth language,… •  Try and keep bullet points to a minimum •  Relevant images are great •  Contact marketing (Steve and Jen) if you need some help with images and/or editing Slide 1
  7. 7. More about Linaro: More about Linaro engineering: How to join: Linaro members: