My node receives around 60000 qph. With the default limit of 512 connections between 200 and 300 new connections are opened every minute (half of them through the ConnectionOpener). I increased my limit to 1024 connections and for an hour and a half uptime only 800 were used up (rtSize=64). The ratio of new connections had dropped to ~70 per minute, and cpu usage had therefore gone down significantly.
So... it may be time to do the buffer pooling. It will solve two problems with one bullet - the high memory requirements and the high cpu usage (as it will allow nodes to have higher number of connections). The default of 512 should stay on *nix systems where root privileges are required to have more than 1k descriptors. On windoze systems there is no limit on the number of sockets, so a more liberal limit can be set.
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