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Tue, 08 May 2007

Unified socket storage.


I've just released a second patchset which implements unified cache of sockets for network instead of old hash tables. It stores all types of sockets (although I only implemented af_inet, unix, netlink and raw ones for now) in single object structure called multidimensional trie (which is similar to judy array in some way).

I performed simple performance test with handmade client and httperf. The former is just epoll driven client which issues requested number of requests one-by-one (or with some concurrency, which does not yet proven to work correctly). With mpm apache on test machine I got sustained 2k/s requests for mdt and about 1200/s for (untuned) hash. With lighttpd and httperf (10k max, 1k rate) I got sustained 1k/s for mdt and 550-1000/s for untuned hash. With tuned hash (thash_entries=1000000) I got both 1k/s, with 30k max, 3k rate httperf I got 1650 for mdt and 1k for tuned hash. Server was with lighttpd 1.4.13. (handmade server as long as 'echo -en "GET / HTTP/1.0\n\n" | nc server 80' does not work due to unknown reason, I did not investigate). Results are quite small for that machine (amd athlon64 3500+ with 1gb of ram and gigabit r8169 adapter), but I have all debug options turned on (including heavy slab/vm).

Patch has been sent to @netdev for review. I asked about discussion about future of this project before making any further steps (mainly statistics code).

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