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

From: Rick Jones <[email-masked]>
Date: Mon, 8 Feb 2016 11:03:30 -0800

Shame on me for not including bare-iron TCP_RR:

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