Riak Save Update speed is too slow

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Riak Save Update speed is too slow

Hi All,

I Have 6 riak kv nodes, each VM have 30gb RAM VM, 8core CUP, 1gbps Ethernet bandwidth

CPU and IO utilization is not issue
load average: 1.14, 1.26, 1.40

root@E2ERiakNode1:~# iperf -c -p 8087
Client connecting to, TCP port 8087
TCP window size:  119 KByte (default)
[  3] local port 35276 connected with port 8087
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  0.00 � ��s  14754482724077531136 Bytes/sec

Still Riak is working too slow, save and update in taking almost more 2 sec for each record
We are not able to identify what is the issue.

Is Ethernet speed is the issue?

Please suggest