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| <chapter id='profile-manual-examples'> |
| |
| <title>Real-World Examples</title> |
| |
| <para> |
| This chapter contains real-world examples. |
| </para> |
| |
| <section id='slow-write-speed-on-live-images'> |
| <title>Slow Write Speed on Live Images</title> |
| |
| <para> |
| In one of our previous releases (denzil), users noticed that booting |
| off of a live image and writing to disk was noticeably slower. |
| This included the boot itself, especially the first one, since first |
| boots tend to do a significant amount of writing due to certain |
| post-install scripts. |
| </para> |
| |
| <para> |
| The problem (and solution) was discovered by using the Yocto tracing |
| tools, in this case 'perf stat', 'perf script', 'perf record' |
| and 'perf report'. |
| </para> |
| |
| <para> |
| See all the unvarnished details of how this bug was diagnosed and |
| solved here: Yocto Bug #3049 |
| </para> |
| </section> |
| |
| </chapter> |
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