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Wednesday, April 17 • 9:00am - 10:00am
Finding Hardware Latencies in Your System - Steven Rostedt, Red Hat

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Fast response times is not always just a perk, but also can be a hard requirement. Over the years, Linux response times has improved tremendously. For a hard realtime response, applying the PREEMPT_RT patch can remove unbounded latencies caused by priority inversion and also improve responses by removing most places that disable preemption in the kernel.

But even with the best Real-Time Operating System (RTOS), the system is a slave to the hardware. If the hardware has System Management Interrupts (SMI), the system can halt at anytime, and the OS can do nothing about it. Finding these can be tricky if the hardware does not give you any clue to what it may do.

This talk will discuss ways to discover hardware latencies such as SMIs,using the PREEMPT_RT patch along with the hwlat_detector that comes with it, as well as using ftrace and kernelshark.

Speakers
avatar for Steven Rostedt

Steven Rostedt

Real Time Kernel, Red Hat
Steven Rostedt has worked for Red Hat over the last 8 years. His primary duty is working on the Real Time Kernel. But since that requires the full analysis of the kernel internals, he developed ftrace (the official Linux tracer) to facilitate the examination of what is happening. Ftrace is now used by most kernel developers outside the Real Time work. Steven is now the maintainer of ftrace and that has consumed most of his time away from... Read More →

Wednesday April 17, 2013 9:00am - 10:00am
Cyril Magnin I

Attendees (16)

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