Network Latency Between Amazon AWS Regions US West-1 and US West-2

We recently had the opportunity to measure the network latency between an Amazon AWS instance in the AWS region US West-1 (Northern California) and one in US West-2 (Oregon).

TCPing and traditional ICMP Ping were used, the machines were Windows Server 2012. 1,500 observations were, taken, about once every minute (Feb 5, 2013).

TCPing

Median :  31.2 milliseconds
Mean :  31.7 milliseconds
95th percentile :  31.2 milliseconds

ICMP Ping

Median :  20 milliseconds
Mean :  20.6 milliseconds
95th percentile :  25 milliseconds

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