PPS (Packets Per Second) Limit for C6i Instance Types in EC2

I apologize, but I don't have specific information about the exact PPS (Packets Per Second) limits for C6i instance types or which Compute Optimized EC2 instance supports the highest PPS limit.

However, I can provide some relevant information about network performance and limitations in EC2 instances:

1. Network performance in EC2 instances is typically measured in terms of bandwidth (Gbps) rather than packets per second. For the c6i.8xlarge instance you mentioned, it has a network bandwidth of 50 Gbps.

2. There is a general limit of 1024 packets per second (PPS) that applies to services using link-local addresses on EC2 instances. This limit includes aggregate traffic for various services like DNS queries, Instance Metadata Service (IMDS) requests, NTP requests, and Windows Licensing Service requests.

3. The network performance of instances can be affected by various factors, including the instance size and type. Larger instances generally offer better network performance.

4. For high-performance networking requirements, you might want to consider using instances with Elastic Network Adapter (ENA) support, which you mentioned you're already using.

5. If you're experiencing performance limitations, you might want to consider using a larger instance size or exploring other instance families that are optimized for network-intensive workloads.

6. AWS Compute Optimizer can provide recommendations for instance types that might better meet your workload's network performance requirements, including considerations for network PPS performance.

Given the complexity of network performance and the lack of specific PPS limits for each instance type, it would be best to contact AWS support directly for more detailed and accurate information about PPS limits for specific instance types. They may be able to provide you with the most up-to-date and accurate information for your use case.
Sources
Access instance metadata for an EC2 instance - Amazon Elastic Compute Cloud
Amazon EC2 C6i Instances - Amazon Web Services
Viewing EC2 instance recommendations - AWS Compute Optimizer