Hi Yanqin && all:
I have studied this ppt && vedio, and tried in my own environment. The
result is in 100K mac-ip PVP test scenario, when EM_FLOW_HASH_SHIFT == 17(emc
entry num is 130K+), the performance can still maintain(a little decline than
10K mac-ip scenario). My formal conclusion is wrong as I didn't notice that if
I generate 100K mac-ip flows , then the mac-table-entry num in ovs bridge
should be enlarge simultaneously(I use the auto learn flow entries)
I also tested scenario that smc is enabled and emc disabled. My result is
pure smc performance is slightly not good as emc.(100K mac-ip flows, pkt size
is 64 bytes, 4pmd lcores , 10G nic , PVP test, smc can reach 3.7G throughput,
latency is 56us. For emc throughput is 4G , latency 51us )
My question is: should emc entry num get enlarged ? Are there any drawbacks
if emc entry is larger than 100K ?
------------------------------------------------------------------
发件人：Yanqin Wei (Arm Technology China) <[email protected]>
发送时间：2019年3月14日(星期四) 10:05
收件人：txfh2007 <[email protected]>; Flavio Leitner <[email protected]>
抄 送：ovs-discuss <[email protected]>
主 题：RE: [ovs-discuss] Re： [HELP] Question about Performance issues in high
concurrency scenarios
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div.MsoNormal{margin:.0in;margin-bottom:.0pt;font-size:11.0pt;font-family:Calibri,sans-serif;}a:link,
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div.msonormal0{mso-style-name:msonormal;mso-margin-top-alt:auto;margin-right:.0in;mso-margin-bottom-alt:auto;margin-left:.0in;font-size:11.0pt;font-family:Calibri,sans-serif;}span.EmailStyle19{mso-style-type:personal-reply;font-family:Calibri,sans-serif;color:windowtext;}.MsoChpDefault{mso-style-type:export-only;font-family:Calibri,sans-serif;}@page
WordSection1{size:8.5in 11.0in;margin:1.0in 1.0in 1.0in
1.0in;}div.WordSection1{page:WordSection1;}-->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]>
发送时间：2019年3月14日(星期四) 04:05
收件人：txfh2007 <[email protected]>
抄 送：ovs-discuss <[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
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