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<div><br class=""><blockquote type="cite" class=""><div class="">On 20 May 2019, at 17:40, Björn Brandenburg <<a href="mailto:bbb@mpi-sws.org" class="">bbb@mpi-sws.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">On 20. May 2019, at 16:40, sobhan niknam <<a href="mailto:sobhan.niknam@yahoo.com" class="">sobhan.niknam@yahoo.com</a>> wrote:<br class=""><blockquote type="cite" class=""><br class="">There is no log file in /dev/litmus to look at.<br class=""></blockquote><br class="">I’m not talking about a LITMUS^RT-specific device file. Check the standard kernel log. <br class=""></div></div></blockquote><div><br class=""></div><div class=""><span class="" style="font-size: 14px;">The buffers overflowed: </span></div><div class=""><span class="" style="font-size: 14px;"><br class=""></span></div><div class=""><div class="" style="font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"><span class="" style="font-size: 14px;">May 21 01:12:37 odroid kernel: [341828.508325] [c1] Failed trace writes: 25486</span></div><div class="" style="font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"><span class="" style="font-size: 14px;">May 21 01:12:37 odroid kernel: [341828.508344] [c3] Failed trace writes: 46617</span></div><div class="" style="font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"><span class="" style="font-size: 14px;">May 21 01:12:37 odroid kernel: [341828.508364] [c0] Failed trace writes: 19335</span></div><div class="" style="font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"><span class="" style="font-size: 14px;">May 21 01:12:37 odroid kernel: [341828.508381] [c2] Failed trace writes: 0</span></div><div class="" style="font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"><span class="" style="font-size: 14px;">May 21 01:12:37 odroid kernel: [341828.508619] [c2] Failed trace writes: 6915121</span></div><div class="" style="font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"><span class="" style="font-size: 14px;">May 21 01:12:37 odroid kernel: [341828.508627] [c0] Failed trace writes: 6713421</span></div><div class="" style="font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"><span class="" style="font-size: 14px;">May 21 01:12:37 odroid kernel: [341828.508696] [c3] Failed trace writes: 23201</span></div><div class="" style="font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"><span class="" style="font-size: 14px;">May 21 01:12:37 odroid kernel: [341828.511328] [c3] Failed trace writes: 7169319</span></div></div><br class=""><blockquote type="cite" class=""><div class=""><div class=""><blockquote type="cite" class="">However, what should I do if supposing the trace buffers overflowed?<br class=""></blockquote><br class="">If you have enough memory, increase the trace buffer size. Otherwise, make sure they get drained quickly enough. <br class=""></div></div></blockquote><div><br class=""></div><div><br class=""></div><span class="" style="font-size: 14px;">I increased the buffer size of each cpu core in /sys/kernel/debug/buffer_size_kb, but the problem still exists!</span><br class=""><br class=""><span class="" style="font-size: 14px;">Sobhan</span><br class=""><br class=""><blockquote type="cite" class=""><div class=""><div class="">- Björn<br class=""><br class=""></div></div></blockquote></div><br class=""></body></html>