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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

Steven Rostedt

Real Time Kernel, Red Hat
Steven Rostedt is the author of the official tracing infrastructure in Linux, known a ftrace. He works with Red Hat on their Real Time kernel, but also spends a lot of time developing new and innovative ways to handle kernel tracing. He also is the author of trace-cmd and kernelshark, the user space too and GUI that interacts with ftrace. Steve has been working on the Linux kernel professionally since January 2001, and before that since 1998 when he was introduced to kernel development while...
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Wednesday April 17, 2013 9:00am - 10:00am
Cyril Magnin I

Attendees (16)

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