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<td style="padding:0px;border:0px;vertical-align:middle"><img src="https://avatars2.githubusercontent.com/u/9976849?v=4?s=40&d=https%3A%2F%2Ftravis-ci.org%2Fimages%2Fmailer%2Fmascot-avatar-40px.png" style="vertical-align:middle;width:40px;height:40px"> <span style="vertical-align:middle;margin-left:3px"><strong><a href="https://travis-ci.org/istokes/ovs?utm_source=email&utm_medium=notification" style="text-decoration:underline;color:#606060">istokes / ovs</a></strong> (<a href="https://github.com/istokes/ovs/tree/pmd_refactor" style="text-decoration:underline;color:#606060">pmd_refactor</a>)</span></td>
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<td class="build-message" style="padding:0px;border:0px;padding:0px 20px 0px 0px;vertical-align:middle;border-top:1px solid #808080;border-bottom:1px solid #adadad"><span style="display:inline-block;margin-top:12px;vertical-align:middle"><a href="https://travis-ci.org/istokes/ovs/builds/328093969?utm_source=email&utm_medium=notification" style="text-decoration:none;font-weight:bold;color:#57769d;text-decoration:underline;color:#df192a">Build #65 failed.</a></span><img src="https://travis-ci.org/images/mailer/arrow-failed.png" style="float: right;" height="45"></td>
<td align="right" class="time" style="padding:0px;border:0px;font-weight:normal;font-size:12px;padding:0px 20px 0px 0px;vertical-align:middle;border-top:1px solid #808080;border-bottom:1px solid #adadad;border-right:1px solid #606060;border-top-right-radius:5px"><div class="stop-watch" style="vertical-align:middle;padding:0px;background-size:20px;display:inline-block;width:20px;height:20px"><img src="https://travis-ci.org/images/mailer/stopwatch-failed.png" width="20" height="20"></div> <span style="vertical-align:middle">3 minutes and 45 seconds</span></td>
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<td class="profile-image" style="border:0px;padding:10px 20px 10px 0px;height:20px;width:50px;padding:0px;border-left:1px solid #adadad;padding-top:20px;padding-bottom:5px;text-align:center"><img src="https://secure.gravatar.com/avatar/32fbc41d9fe626754c3773f9ccb38ce8?s=15&d=https%3A%2F%2Ftravis-ci.org%2Fimages%2Fmailer%2Fmascot-avatar-15px.png"></td>
<td class="grey" style="padding:0px;border:0px;color:#808080;padding:10px 20px 10px 0px;height:20px;padding-top:20px;padding-bottom:5px"><strong>Jan Scheurich</strong></td>
<td align="right" class="grey" style="padding:0px;border:0px;color:#808080;padding:10px 20px 10px 0px;height:20px;border-right:1px solid #adadad;padding-top:20px;padding-bottom:5px"><a href="https://github.com/istokes/ovs/commit/f7594dc0924c2b1b9032a3f9fdcd960b4126cca3" style="text-decoration:underline;text-decoration:none;font-weight:bold;color:#57769d">f7594dc</a> <a href="https://github.com/istokes/ovs/compare/fc1d1260d04a%5E...f7594dc0924c" style="text-decoration:underline;text-decoration:none;font-weight:bold;color:#57769d">Changeset →</a></td>
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<td style="border:0px;padding:10px 20px 10px 0px;height:20px;width:50px;padding:0px;border-left:1px solid #adadad;border-bottom-left-radius:5px;border-bottom:1px solid #adadad"> </td>
<td colspan="2" class="grey" style="padding:0px;border:0px;color:#808080;padding:10px 20px 10px 0px;height:20px;border-right:1px solid #adadad;padding-bottom:20px;padding-top:0px;border-bottom:1px solid #adadad;border-bottom-right-radius:5px">dpif-netdev: Refactor cycle counting<br><br>Simplify the historically grown TSC cycle counting in PMD threads.<br>Cycles are currently counted for the following purposes:<br><br>1. Measure PMD ustilization<br><br>PMD utilization is defined as ratio of cycles spent in busy iterations<br>(at least one packet received or sent) over the total number of cycles.<br><br>This is already done in pmd_perf_start_iteration() and<br>pmd_perf_end_iteration() based on a TSC timestamp saved in current<br>iteration at start_iteration() and the actual TSC at end_iteration().<br>No dependency on intermediate cycle accounting.<br><br>2. Measure the processing load per RX queue<br><br>This comprises cycles spend on polling and processing packets received<br>from the rx queue and the cycles spent on delayed sending of these packets<br>to tx queues (with time-based batching).<br><br>The previous scheme using cycles_count_start(), cycles_count_intermediate()<br>and cycles-count_end() originally introduced to simplify cycle counting<br>and saving calls to rte_get_tsc_cycles() was rather obscuring things.<br><br>Replace by a nestable cycle_timer with with start and stop functions to<br>embrace a code segment to be timed. The timed code may contain arbitrary<br>nested cycle_timers. The duration of nested timers is excluded from the<br>outer timer.<br><br>The caller must ensure that each call to cycle_timer_start() is<br>followed by a call to cycle_timer_end(). Failure to do so will lead to<br>assertion failure or a memory leak.<br><br>The new cycle_timer is used to measure the processing cycles per rx queue.<br>This is not yet strictly necessary but will be made use of in a subsequent<br>commit.<br><br>All cycle count functions and data are relocated to module<br>dpif-netdev-perf.<br><br>Signed-off-by: Jan Scheurich <jan.scheurich@ericsson.com></td>
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