Hi, There is a interesting topic in Open vSwitch 2018 Fall Conference maybe helpful for you. It shows EMC/SMC behave different performance in high concurrency case. For your case, SMC may be more helpful.
http://www.openvswitch.org/support/ovscon2018/5/1330-theurer.pdf From: [email protected] <[email protected]> On Behalf Of txfh2007 via discuss Sent: Thursday, March 14, 2019 9:00 AM To: Flavio Leitner <[email protected]> Cc: ovs-discuss <[email protected]> Subject: [ovs-discuss] Re： [HELP] Question about Performance issues in high concurrency scenarios Thanks，Flavio: So there are two questions: 1. Is dpcls lookup More efficiency than EMC? 2. If I just want to enlarge emc entry num by change EM_FLOW_HASH_SHIFT value, are there any drawbacks ? ------------------------------------------------------------------ 发件人：Flavio Leitner <[email protected]<mailto:[email protected]>> 发送时间：2019年3月14日(星期四) 04:05 收件人：txfh2007 <[email protected]<mailto:[email protected]>> 抄 送：ovs-discuss <[email protected]<mailto:[email protected]>> 主 题：Re: [ovs-discuss] [HELP] Question about Performance issues in high concurrency scenarios On Tue, Mar 05, 2019 at 03:38:43PM +0800, txfh2007 via discuss wrote: > Hi everyone: > I have test ovs-dpdk PVP performance for several days . And I > have found in high concurrency scenarios(eg. 100K mac-ip > streams), the ovs-dpdk performance gets significant decline. > And one cause of performance decline is the emc entry num > limitation, is that right? If I just increase emc entry num, > will other problems occur ? Are there any suggession helping to > get performance improvement under high concurrency scenarios? Perhaps you could consider disabling EMC if its size is not enough. fbl IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
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