netdev - Re: Disabling XPS for 4.4.0-1+ixgbe+OpenStack VM over a VLAN means 65% increase in netperf TCP

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Date:	Mon, 8 Feb 2016 11:03:30 -0800
From:	Rick Jones <rick.jones2@....com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Disabling XPS for 4.4.0-1+ixgbe+OpenStack VM over a VLAN means
 65% increase in netperf TCP_STREAM


Shame on me for not including bare-iron TCP_RR:

stack@...erf-cp1-comp0001-mgmt:~$ grep "1       1" xps_tcp_rr_on_* | awk 
'{t+=$6;r+=$9;s+=$10}END{print "throughput",t/NR,"recv sd",r/NR,"send 
sd",s/NR}'
throughput 18589.4 recv sd 21.6296 send sd 20.5931
stack@...erf-cp1-comp0001-mgmt:~$ grep "1       1" xps_tcp_rr_off_* | 
awk '{t+=$6;r+=$9;s+=$10}END{print "throughput",t/NR,"recv 
sd",r/NR,"send sd",s/NR}'
throughput 20883.6 recv sd 19.6255 send sd 20.0178

So that is 12% on TCP_RR throughput.

Looks like XPS shouldn't be enabled by default for ixgbe.

happy benchmarking,

rick jones