cpuidle results in ethernet degredation ?

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Hello,

I hope some will have some idea:
I am using iperf to check bandwidth and I see that with small tcp
windows in the test there is always high degredation in performance
compared to version without cpuidle.
I've noticed that C3 state (core inactive) is entered several times
during the test, which might explaing this degredation. With bug tcp
windows it works well (why ?)

I would like to ask if there is any idea what I can do to overcome
this issue so that there will be no degredation in performance?

Thank you,
Ran
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