is there room for improvement in security_port_sid() ? little test with dns queries (dnsfilter (the client) on local host using poll() and dnscache (the server) using epoll (at max 4000 concurrent queries): (stats for only vmlinux)
CPU: P4 / Xeon, speed 2797.32 MHz (estimated) Counted GLOBAL_POWER_EVENTS events (time during which processor is not stopped) with a unit mask of 0x01 (mandatory) count 45000 Counted FSB_DATA_ACTIVITY events (DRDY or DBSY events on the front side bus) with a unit mask of 0x03 (multiple flags) count 45000 Counted BRANCH_RETIRED events (retired branches) with a unit mask of 0x05 (multiple flags) count 45000 Counted BRANCH_RETIRED events (retired branches) with a unit mask of 0x0a (multiple flags) count 45000 samples % samples % samples % samples % symbol name 220663 10.2181 6704 17.9737 5735 7.5171 27 1.1989 datagram_poll 140086 6.4869 3239 8.6839 3786 4.9624 24 1.0657 sock_poll 119636 5.5399 2172 5.8232 7168 9.3954 24 1.0657 do_poll 101512 4.7006 3987 10.6893 812 1.0643 14 0.6217 udp_get_port 71008 3.2881 1017 2.7266 2694 3.5311 397 17.6288 security_port_sid 64350 2.9798 144 0.3861 1912 2.5061 6 0.2664 add_wait_queue 60815 2.8161 187 0.5014 3246 4.2546 2 0.0888 remove_wait_queue 47456 2.1975 1823 4.8875 476 0.6239 31 1.3766 udp_v4_lookup_longway if dnsfilter had used epoll, security_port_sid would probably (?) be number one (or two or three) CPU user in kernel. also note that 17.6% of mispredicted branches occurr in security_port_sid. -- Do what you love because life is too short for anything else. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
