[UCS] vmnic received packets dropped

Symptoms: 

Vmnic receive packet drop occurred on cisco ucs.

this issue can find out with only cisco servers.

another brand server doesn't find this issue

the main symptoms as follows

"esxcli network nic stats get -n vmnic1"

NIC statistic for vmnic1

Received packets dropped: 28571

Transmit packets dropped:0"

 

Workaround

We're comparing with buffer ring size configuration with HP NIC Cards using below commands

# esxcli network nic ring preset get -n vmnicX

threshold value for vmnic buffer ring size.

# esxcli network nic ring current get -n vmnicX"

current value for vmnic buffer ring size

 

Threshold value size as hp server and cisco server is same.

Cisco server's current value size is smaller than hp server value size.

 

Cisco server's current value size is RX:512, TX:256

HP server's current value size is RX: 1020, TX:4096

 

Reference

https://kb.vmware.com/s/article/50121760