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The first test only accepts a new connection, reads the request, parses it, checks an ACL, sends a redirect
and closes. A session rate of 132000 connections per second could even be measured in pure TCP mode, but this
is not very useful :
The second test forwards the request to a real server instead, and fetches a 64-byte object :
These improvements are due to the ability to tell the system to merge some carefully chosen TCP packets at critical phases of the session. This results in lower number of packets per session, which in turn saves both bandwidth and CPU cycles. The smallest session is now down to 5-6 packets on each side, down from 9 initially.