about redis info instantaneous_input_kbps

[bugl...@gmail.com]

hi :

    I want to monitor redis traffic through redis info.But I found instantaneous_input_kbps and instantaneous_output_kbps are not the true traffic about redis.

Instantaneous_input_kbps is smaller than the true traffic.

Is there something wrong?

######################sending data to redis

#network traffic

Time              -------------traffic------------ 

Time               bytin  bytout   pktin  pktout   

26/02/16-16:30:25   1.2M  310.0K    5.5K    3.9K   

26/02/16-16:30:27   1.2M  314.2K    5.5K    3.9K   

26/02/16-16:30:29   1.1M  321.5K    5.4K    3.9K   

26/02/16-16:30:31   1.2M  313.7K    5.5K    3.9K   

26/02/16-16:30:33   1.3M  321.0K    5.6K    4.0K   

26/02/16-16:30:35   1.2M  308.2K    5.3K    3.8K   

26/02/16-16:30:37   1.2M  308.9K    5.4K    3.8K   

####redis info

instantaneous_input_kbps:678.29

instantaneous_output_kbps:4.85

instantaneous_input_kbps:666.07

instantaneous_output_kbps:4.79

instantaneous_input_kbps:676.34

instantaneous_output_kbps:4.85

instantaneous_input_kbps:675.49

instantaneous_output_kbps:4.84

instantaneous_input_kbps:671.42

instantaneous_output_kbps:4.82

instantaneous_input_kbps:667.50

instantaneous_output_kbps:4.80

instantaneous_input_kbps:666.37

instantaneous_output_kbps:4.79

#####################stop sending data

Time              -------------traffic------------ 

Time               bytin  bytout   pktin  pktout   

26/02/16-16:34:59 157.5K   22.7K  226.00  228.00   

26/02/16-16:35:01 159.8K   24.9K  235.00  237.00   

26/02/16-16:35:03 208.9K  134.5K  901.00  947.00   

26/02/16-16:35:05 133.3K   61.1K  285.00  269.00   

^C

##redis info

instantaneous_output_kbps:1.17

instantaneous_input_kbps:0.01

instantaneous_output_kbps:1.17

instantaneous_input_kbps:0.01

instantaneous_output_kbps:1.16

instantaneous_input_kbps:0.01

instantaneous_output_kbps:1.17

instantaneous_input_kbps:0.01

instantaneous_output_kbps:1.17

instantaneous_input_kbps:0.01

instantaneous_output_kbps:1.17

[CharSyam]

It is calculated by sampling.

so it is not same with the real traffic

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