An Experimental Analysis of Round-Trip Time Under Varying Resource Workloads in a VMware-Based Virtualized Network Environment

Round-trip time (RTT) is a practical measure of communication responsiveness because it records the time required for a probe packet to travel to a destination and for a response to return. In virtualized environments, packet timing may be affected by competition for CPU processing, storage operations, and network capacity. This study examined how selected resource workloads were associated with RTT in a VMware-based virtual network. RTT was measured using a Windows PowerShell script that sent up to 1,000 ICMP echo requests to a target address and recorded response times, packet loss, and descriptive statistics. Twenty test conditions covered connectivity verification, baseline operation, CPU workload, disk activity, network traffic at increasing stream counts, recovery periods, and combined workloads. The reported baseline mean RTT was 1.84 ms. Under CPU load, mean RTT increased to 3.27–3.41 ms; under disk activity, it ranged from 2.48 to 2.67 ms; and under network load, it rose from 4.10 ms with one stream to 7.84 ms with four streams. The highest reported mean, 8.92 ms, occurred during combined CPU and network load, accompanied by 1.1% packet loss. Mean RTT returned close to baseline during the reported recovery conditions. These descriptive results show an association between resource workload and increased RTT in the tested environment. Because hardware specifications, VM allocations, and raw packet-level data were not fully documented in the available record, the findings should be interpreted as environment-specific rather than generalized to all virtualization platforms.

round-trip time, virtualization, VMware, resource contention, network latency, packet loss, CPU workload, disk I/O

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