Std deviation "-nan" and negative mean value issue in netperf

[kshivanand-max]

Hi All,

I'm trying to run netperf tool for 24hr to capture the network latencies using below command,

netperf -H IP_Addr -t TCP_STREAM -l 86400 -- -o min_latency,mean_latency,max_latency,stddev_latency

Here the "stddev_latency" value is showing as "-nan" and also mean_latency value is negative.

Is there any way to capture the raw latency data?
We need raw data to analyze the issue and also to calculate std dev latency locally.

Please note that there are no issues if I run the same command for lower durations (2-3hrs).

Any help would be much appreciated,

Thank you.