6.5.1

Action
Parameter in the
vSphere Web Client
Parameter for the esxcli
system settings sdvanced
set Command
Value
Set a default interrupt rate higher than the
expected packet rate. For example, set the
interrupt rate to 16000 if 15000 interrupts are
expected per second.
Net.CoalesceScheme
Net.CoalesceParams
/Net/CoalesceScheme
/Net/CoalesceParams
rbc
16000
Disable coalescing for low throughput or
latency-sensitive workloads. For information
about configuring low-latency workloads, see
Best Practices for Performance Tuning of
Latency-Sensitive Workloads in vSphere
VMs.
Net.CoalesceDefaultOn /Net/CoalesceDefaultOn
0
Revert to the coalescing scheme from earlier
ESXi releases.
Note The ability to revert to the earlier
algorithm will not be available in later
vSphere releases.
Net.CoalesceScheme /Net/CoalesceScheme
calibrate
For information about configuring a host from the vSphere Web Client, see the vCenter Server and
Host Management documentation. For information about setting host properties by using a vCLI
command, refer to the vSphere Command-Line Interface Reference documentation.
Virtual Machines on the Same Distributed Port Group and
on Dierent Hosts Cannot Communicate with Each Other
Under certain conditions, the virtual machines that are on the same distributed port group but on different
hosts cannot communicate with each other.
Problem
Virtual machines that reside on different hosts and on the same port group are unable to communicate.
Pings from one virtual machine to another have no effect. You cannot migrate the virtual machines
between the hosts by using vMotion.
Cause
n
There are no physical NICs on some of the hosts assigned to active or standby uplinks in the teaming
and failover order of the distributed port group.
n
The physical NICs on the hosts that are assigned to the active or standby uplinks reside in different
VLANs on the physical switch. The physical NICs in different VLANs cannot see each other and thus
cannot communicate with each other.
Solution
n
In the topology of the distributed switch, check which host does not have physical NICs assigned to
an active or standby uplink on the distributed port group. Assign at least one physical NIC on that
host to an active uplink on the port group.
vSphere Troubleshooting
VMware, Inc. 99