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AIX, nmon, and network utilization

Posted on 2011-09-07
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Last Modified: 2013-11-17
Below is a screenshot using nmon (with the network option):

 Network ---------------------------------------------------------------------¦
¦I/F Name Recv=KB/s Trans=KB/s packin packout insize outsize Peak->Recv TransKB¦
¦    en0  133627.5  139348.6 125766.9 133310.9 1088.0 1070.4    192420.6 170788¦
¦    lo0       0.0       0.0      0.0      0.

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'eno' is a 10GB network adapter.

I assume that since I have about 135 MB/s, and that I have to
divide the 10GB by 8 to get a the numbers of btes
(10 GB adapter is 10 GBits, not bytes) that this calc will bive me
my network utilization.

Therefore I assume I have about a 10.8 percent network utilization

Is this correct ?
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Question by:Los Angeles1
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Expert Comment

by:woolmilkporc
ID: 36499295
Well,

because there are roundabout 130 MB/sec received and 136 MB/sec transmitted there is an overall utilization of some 20.7 percent.

Dividing by 8 is of course correct.

Please be aware that this calculated utilization is not caused by pure payload, but also by protocol overhead at the diverse layers and also by possible retransmits.

wmp
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Accepted Solution

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woolmilkporc earned 2000 total points
ID: 36499523
Taking the mandatory full-duplex mode of 10 Gb Ethernet into account you could actually say that the overall bandwith utilization is indeed just 10,7 percent!
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