On 02/04/2016 11:38 AM, Tom Herbert wrote:
I'd start with verifying the XPS configuration is sane and then trying
to reproduce the issue outside of using VMs, if both of those are okay
then maybe look at some sort of bad interaction with OpenStack
configuration.
So, looking at bare-iron, I can see something similar but not to the
same degree (well, depending on which is one's metric of interest I guess):
XPS being enabled for ixgbe here looks to be increasing receive side
service demand by 30% but there is enough CPU available in this setup
that it is only a loss of 2.5% or so on throughput.
stack@fcperf-cp1-comp0001-mgmt:~$ grep 87380 xps_on_* | awk
'{t+=$6;r+=$9;s+=$10}END{print "throughput",t/NR,"recv sd",r/NR,"send
sd",s/NR}'
throughput 9072.52 recv sd 0.8623 send sd 0.3686
stack@fcperf-cp1-comp0001-mgmt:~$ grep TCPOFO xps_on_* | awk '{sum +=
$NF}END{print "sum",sum/NR}'
sum 1621.1
stack@fcperf-cp1-comp0001-mgmt:~$ grep 87380 xps_off_* | awk
'{t+=$6;r+=$9;s+=$10}END{print "throughput",t/NR,"recv sd",r/NR,"send
sd",s/NR}'
throughput 9300.48 recv sd 0.6543 send sd 0.3606
stack@fcperf-cp1-comp0001-mgmt:~$ grep TCPOFO xps_off_* | awk '{sum +=
$NF}END{print "sum",sum/NR}'
sum 173.9
happy benchmarking,
rick jones
raw results at ftp://ftp.netperf.org/xps_4.4.0-1_ixgbe.tgz
