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Andrew Geissler4873add2020-11-02 18:44:49 -06001<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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6<chapter id='profile-manual-examples'>
7
8<title>Real-World Examples</title>
9
10<para>
11 This chapter contains real-world examples.
12</para>
13
14<section id='slow-write-speed-on-live-images'>
15 <title>Slow Write Speed on Live Images</title>
16
17 <para>
18 In one of our previous releases (denzil), users noticed that booting
19 off of a live image and writing to disk was noticeably slower.
20 This included the boot itself, especially the first one, since first
21 boots tend to do a significant amount of writing due to certain
22 post-install scripts.
23 </para>
24
25 <para>
26 The problem (and solution) was discovered by using the Yocto tracing
27 tools, in this case 'perf stat', 'perf script', 'perf record'
28 and 'perf report'.
29 </para>
30
31 <para>
32 See all the unvarnished details of how this bug was diagnosed and
33 solved here: Yocto Bug #3049
34 </para>
35</section>
36
37</chapter>
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