<div class="__aliyun_email_body_block"><div  style="line-height:1.7;font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;"><div  style="clear:both;">Thanks，Flavio:</div><div  style="clear:both;">&nbsp;&nbsp;&nbsp;&nbsp;So there are two questions:&nbsp;</div><div  style="clear:both;">&nbsp;&nbsp;&nbsp;&nbsp;1. Is dpcls lookup More efficiency than EMC?</div><div  style="clear:both;">&nbsp; &nbsp; 2. If I just want to enlarge emc entry num by change EM_FLOW_HASH_SHIFT value, are there any drawbacks ?</div><div  style="clear:both;"><br ></div><div  style="clear:both;"><br ></div><blockquote  style="color:#000000;font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;margin-top:.0px;margin-right:.0px;margin-bottom:.0px;"><div  style="clear:both;">------------------------------------------------------------------</div><div  style="clear:both;">发件人：Flavio Leitner &lt;fbl@sysclose.org&gt;</div><div  style="clear:both;">发送时间：2019年3月14日(星期四) 04:05</div><div  style="clear:both;">收件人：txfh2007 &lt;txfh2007@aliyun.com&gt;</div><div  style="clear:both;">抄　送：ovs-discuss &lt;ovs-discuss@openvswitch.org&gt;</div><div  style="clear:both;">主　题：Re: [ovs-discuss] [HELP] Question about Performance issues in high concurrency scenarios</div><div  style="clear:both;"><br ></div>On&nbsp;Tue,&nbsp;Mar&nbsp;05,&nbsp;2019&nbsp;at&nbsp;03:38:43PM&nbsp;+0800,&nbsp;txfh2007&nbsp;via&nbsp;discuss&nbsp;wrote:<br >&gt;&nbsp;Hi&nbsp;everyone:&nbsp;&nbsp;&nbsp;&nbsp;<br >&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I&nbsp;have&nbsp;test&nbsp;ovs-dpdk&nbsp;PVP&nbsp;performance&nbsp;for&nbsp;several&nbsp;days&nbsp;.&nbsp;And&nbsp;I<br >&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;have&nbsp;found&nbsp;in&nbsp;high&nbsp;concurrency&nbsp;scenarios(eg.&nbsp;100K&nbsp;mac-ip<br >&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;streams),&nbsp;the&nbsp;ovs-dpdk&nbsp;performance&nbsp;gets&nbsp;significant&nbsp;decline.<br >&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;And&nbsp;one&nbsp;cause&nbsp;of&nbsp;performance&nbsp;decline&nbsp;is&nbsp;the&nbsp;emc&nbsp;entry&nbsp;num<br >&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;limitation,&nbsp;is&nbsp;that&nbsp;right?&nbsp;If&nbsp;I&nbsp;just&nbsp;increase&nbsp;emc&nbsp;entry&nbsp;num,<br >&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;will&nbsp;other&nbsp;problems&nbsp;occur&nbsp;?&nbsp;Are&nbsp;there&nbsp;any&nbsp;suggession&nbsp;helping&nbsp;to<br >&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;get&nbsp;performance&nbsp;improvement&nbsp;under&nbsp;high&nbsp;concurrency&nbsp;scenarios?<br >&nbsp;<br ><br >Perhaps&nbsp;you&nbsp;could&nbsp;consider&nbsp;disabling&nbsp;EMC&nbsp;if&nbsp;its&nbsp;size&nbsp;is&nbsp;not&nbsp;enough.<br >fbl</blockquote><div  style="line-height:20.0px;clear:both;"><br ></div></div></div>