[netperf-talk] Re: Difficultly in understanding the CPU utilization results for UDP stream test

[Rick Jones]

Well, I've tried to reproduce your results, with a pair of four-core 
systems running a 2.6.9.mumble RHAS4u5 environment and the top of trunk. 
    With --enable-intervals, I see "sane" CPU util numbers which appear 
to match the output of top.  I am using command-lines like:

[root at hpcpc107 netperf2_work]# src/netperf -t UDP_STREAM -H hpcpc106 -C 
-b 8 -w 10000 -l 120
UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 
hpcpc106.cup.hp.com (16.89.84.106) port 0 AF_INET : interval
Socket  Message  Elapsed      Messages                   CPU      Service
Size    Size     Time         Okay Errors   Throughput   Util     Demand
bytes   bytes    secs            #      #   10^6bits/sec % US     us/KB

135168   65507   119.94         96      0        0.4     -1.00    -1.000
135168           119.94         96               0.4     0.11     88.518

and I am _not_ using a -n option.  So, unless we have some other 
command-line differences, or there is something in an older netperf 
version (this is top of trunk, which will be 2.4.4 when I decide to tag 
it) it seems there is something truly odd in your systems.


rick