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Date: Wed, 24 Aug 2016 08:52:18 -0700 From: Rick Jones <rick.jones2@....com> To: netdev@...r.kernel.org Cc: sathya.perla@...adcom.com, ajit.khaparde@...adcom.com, sriharsha.basavapatna@...adcom.com, somnath.kotur@...adcom.com Subject: A second case of XPS considerably reducing single-stream performance Back in February of this year, I reported some performance issues with the ixgbe driver enabling XPS by default and instance network performance in OpenStack: http://www.spinics.net/lists/netdev/msg362915.html I've now seen the same thing with be2net and Skyhawk. In this case, the magnitude of the delta is even greater. Disabling XPS increased the netperf single-stream performance out of the instance from an average of 4108 Mbit/s to 8888 Mbit/s or 116%. Should drivers really be enabling XPS by default? Instance To Outside World Single-stream netperf ~30 Samples for Each Statistic Mbit/s Skyhawk BE3 #1 BE3 #2 XPS On XPS Off XPS On XPS Off XPS On XPS Off Median 4192 8883 8930 8853 8917 8695 Average 4108 8888 8940 8859 8885 8671 happy benchmarking, rick jones The sample counts below may not fully support the additional statistics but for the curious: raj@...dy:/tmp$ ~/netperf2_trunk/doc/examples/parse_single_stream.py -r 6 waxon_performance.log -f 2 Field2,Min,P10,Median,Average,P90,P99,Max,Count be3-1,8758.850,8811.600,8930.900,8940.555,9096.470,9175.839,9183.690,31 be3-2,8588.450,8736.967,8917.075,8885.322,9017.914,9075.735,9094.620,32 skyhawk,3326.760,3536.008,4192.780,4108.513,4651.164,4723.322,4724.320,27 0 too-short lines ignored. raj@...dy:/tmp$ ~/netperf2_trunk/doc/examples/parse_single_stream.py -r 6 waxoff_performance.log -f 2 Field2,Min,P10,Median,Average,P90,P99,Max,Count be3-1,8461.080,8634.690,8853.260,8859.870,9064.480,9247.770,9253.050,31 be3-2,7519.130,8368.564,8695.140,8671.241,9068.588,9200.719,9241.500,27 skyhawk,8071.180,8651.587,8883.340,8888.411,9135.603,9141.229,9142.010,32 0 too-short lines ignored. "waxon" is with XPS enabled, "waxoff" is with XPS disabled. The servers are the same models/config as in February. stack@...cp1-comp0013-mgmt:~$ sudo ethtool -i hed3 driver: be2net version: 10.6.0.3 firmware-version: 10.7.110.45
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