1*4882a593Smuzhiyun.. SPDX-License-Identifier: CC-BY-SA-2.0-UK 2*4882a593Smuzhiyun 3*4882a593Smuzhiyun******************* 4*4882a593SmuzhiyunReal-World Examples 5*4882a593Smuzhiyun******************* 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun| 8*4882a593Smuzhiyun 9*4882a593SmuzhiyunThis chapter contains real-world examples. 10*4882a593Smuzhiyun 11*4882a593SmuzhiyunSlow Write Speed on Live Images 12*4882a593Smuzhiyun=============================== 13*4882a593Smuzhiyun 14*4882a593SmuzhiyunIn one of our previous releases (denzil), users noticed that booting off 15*4882a593Smuzhiyunof a live image and writing to disk was noticeably slower. This included 16*4882a593Smuzhiyunthe boot itself, especially the first one, since first boots tend to do 17*4882a593Smuzhiyuna significant amount of writing due to certain post-install scripts. 18*4882a593Smuzhiyun 19*4882a593SmuzhiyunThe problem (and solution) was discovered by using the Yocto tracing 20*4882a593Smuzhiyuntools, in this case 'perf stat', 'perf script', 'perf record' and 'perf 21*4882a593Smuzhiyunreport'. 22*4882a593Smuzhiyun 23*4882a593SmuzhiyunSee all the unvarnished details of how this bug was diagnosed and solved 24*4882a593Smuzhiyunhere: Yocto Bug #3049 25