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1<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
2"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
3[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
4
5<chapter id='profile-manual-examples'>
6
7<title>Real-World Examples</title>
8
9<para>
10 This chapter contains real-world examples.
11</para>
12
13<section id='slow-write-speed-on-live-images'>
14 <title>Slow Write Speed on Live Images</title>
15
16 <para>
17 In one of our previous releases (denzil), users noticed that booting
18 off of a live image and writing to disk was noticeably slower.
19 This included the boot itself, especially the first one, since first
20 boots tend to do a significant amount of writing due to certain
21 post-install scripts.
22 </para>
23
24 <para>
25 The problem (and solution) was discovered by using the Yocto tracing
26 tools, in this case 'perf stat', 'perf script', 'perf record'
27 and 'perf report'.
28 </para>
29
30 <para>
31 See all the unvarnished details of how this bug was diagnosed and
32 solved here: Yocto Bug #3049
33 </para>
34</section>
35
36</chapter>
37<!--
38vim: expandtab tw=80 ts=4
39-->