Hi Team, We use haproxy to front tls for a large number of endpoints, haproxy prcesses the TLS session and then forwards the request to the backend application. What we have noticed is that if there are a large number of connections from different clients - the CPU usage goes up significantly. This primarily because haproxy is handling a lot ofSSL connections. I came across 2 options above and tested them out.
With maxsslrate - CPU is better controlled and if I combine this with 503 response in the front end I see great results. Is there a possibility of connection timeout on the client here if there are a very large number of requests? With maxsslconn, CPU is still pegged high - and clients receive a tcp reset. This is also good, because there is no chance of tcp time out on the client. Clients can retry after a bit and they are aware that the connection is closed instead of waiting on timeout. However, CPU still seems pegged high. What is the reason for high CPU on the server here - Is it because SSL stack is still hit with this setting? -- Regards, Mihir
