Performance Indicators

CLB Performance Indicators

• Connections Per Second (CPS): The number of new connections established per second, reflecting the capability to handle incoming connections.
• Maximum Concurrent Connections: The total number of simultaneous connections sustained per second, demonstrating the capacity for concurrent connection processing.
• Packets Per Second (PPS): The number of packets forwarded per second, indicating the packet forwarding rate.
• Maximum Throughput: The supported bandwidth capacity.
• Queries Per Second (QPS): The number of queries processed per second. For instances, QPS is not a core metric—CPS is the true performance driver. In short-connection scenarios, QPS equals CPS; in long-connection scenarios, QPS exceeds CPS.

Note: The following performance indicators represent the theoretical maximum performance under simple and ideal traffic conditions. The limitations and explanations are as follows:

1. Packet forwarding type can achieve the performance shown in the table with a single instance, while request proxy type shares resources among all instances within the VPC.

2. Enabling the log management function will cause a 10% performance degradation.

3. The ssl cps metrics are obtained through stress testing under the TLSv1.2 algorithm with ECDHE-RSA-AES256-GCM-SHA384, 2048-bit key, and 256-bit encryption. More performance-intensive algorithms may fail to meet these indicators.

4. CLB instances are deployed in a cluster mode, and each instance runs in a multi-process mode on cluster servers. Therefore, unbalanced traffic sources—especially single-source traffic—cannot achieve maximum performance.

5. The maximum concurrent connection count for request proxy type instances refers to the sum of connections from clients to CLB and from CLB to RServers. The monitoring data only shows the connection count from clients to CLB.

6. CLB is a shared-type instance, and maximum performance is not guaranteed. For performance-guaranteed solutions, consider using the Application Load Balancer (ALB).