| Andrew Geissler | f034379 | 2020-11-18 10:42:21 -0600 | [diff] [blame] | 1 | .. SPDX-License-Identifier: CC-BY-SA-2.0-UK |
| Andrew Geissler | c9f7865 | 2020-09-18 14:11:35 -0500 | [diff] [blame] | 2 | |
| 3 | ******************* |
| 4 | Real-World Examples |
| 5 | ******************* |
| 6 | |
| 7 | | |
| 8 | |
| 9 | This chapter contains real-world examples. |
| 10 | |
| 11 | Slow Write Speed on Live Images |
| 12 | =============================== |
| 13 | |
| 14 | In one of our previous releases (denzil), users noticed that booting off |
| 15 | of a live image and writing to disk was noticeably slower. This included |
| 16 | the boot itself, especially the first one, since first boots tend to do |
| 17 | a significant amount of writing due to certain post-install scripts. |
| 18 | |
| 19 | The problem (and solution) was discovered by using the Yocto tracing |
| 20 | tools, in this case 'perf stat', 'perf script', 'perf record' and 'perf |
| 21 | report'. |
| 22 | |
| 23 | See all the unvarnished details of how this bug was diagnosed and solved |
| 24 | here: Yocto Bug #3049 |