Hi Jeremy,

I try reproduce your result and then fix the issue, but I do not reproduce it
 yet.

I run at netperf-2.6.0 at one machine as server: netserver, other
machine: netperf -t TCP_RR -H $SERVER_IP -l 60. The target machine is
used in both client and server. I do not reproduce the performance drop
issue. I also notice the result is not stable, sometime it is high,
sometime is low. In sumarry, it is hard to make a definite result.

Can you try tell me how to reproduce the issue? how do you get the C0
data?

What's your config for kernel?  Do you enable CONFIG_NO_HZ_FULL=y or
only CONFIG_NO_HZ=y?


Thanks
-Youquan 
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