MAD24-211 Boot time optimization project

• Wednesday, 15 May 11:45 - 12:10
• Room: Session 2 | Tenerife I

Systems with industry standards like automotive have strong requirements to ensure the boot process is fast enough to put the system in a ready state. Others consider the boot time less important when the system is powered up but want a quick wake up from an hibernate state. The platform boot time optimization is usually platform specific and use case centric which implies a dedicated set of changes. Those will be deprecated with a new hardware having different drivers or a new software version which may introduce latencies in the boot time process. The boot time optimization project aims to put in place a continuous integration loop to monitor the boot timings and detect regressions over updates. In addition, from an engineering point of view, it identifies a set of changes to be done in the different steps of the boot chain, from the firmware to the userspace. This presentation will describe the project which is split into two parts. The first part will present the boot time continuous integration architecture. We will also discuss the boot timings information to be passed along the different components of the boot chain and how to standardize them in order to retrieve the information in the monitoring process. The second part will list a set of identified bottlenecks responsible for latencies in the boot process. We will propose a way to fix them up and discuss the solutions. It is also an opportunity to share our experience and point out other bottlenecks we may have missed.

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