Hello, I'm in a situation where i have 5 proxies (5.5.7) deployed on AWS on 6cni.xlarge instances (4 cpu/8gb), all they're doing is taking TLS connections and forwarding everything to the proxy-dialogs (5.5.2). We opened traffic on these 5 proxies for about 20k clients. CPU just goes to 100% and stays there... (actually moving from core to core 100%). We were doing tls offloading on AWS but routing was a bit of a mess (receiving tls traffic on a non-tls, etc) and we never saw a problem CPU-wise there. config looks like #!define WORKERS 32 #!define MAX_TCP_TLS_CONNECTIONS 30000 #!define OPEN_FILES 65535 #!define TCP_CHILDREN_PROCESS 16 tcp_accept_no_cl=no # Needed for HTTP ( https://www.kamailio.org/wiki/cookbooks/devel/core#tcp_accept_no_cl) enable_tls=yes tls_port_no=TLS_PORT auto_aliases=no tcp_children=32 # socket_workers=WORKERS listen=EXTERNAL_LISTEN_SOCKET listen=EXTERNAL_LISTEN_SOCKET_TLS # socket_workers=WORKERS listen=INTERNAL_UDP_SOCKET I even attached gdb and all i see is: (gdb) bt #0 0x00001499de9e9853 in __libc_pause () at ../sysdeps/unix/sysv/linux/pause.c:29 #1 0x000055a58c1a8e6f in main_loop () #2 0x000055a58c1b29a1 in main () (gdb) #0 0x00001499de9e9853 in __libc_pause () at ../sysdeps/unix/sysv/linux/pause.c:29 #1 0x000055a58c1a8e6f in main_loop () #2 0x000055a58c1b29a1 in main () (gdb) #0 0x00001499de9e9853 in __libc_pause () at ../sysdeps/unix/sysv/linux/pause.c:29 #1 0x000055a58c1a8e6f in main_loop () #2 0x000055a58c1b29a1 in main () (gdb) #0 0x00001499de9e9853 in __libc_pause () at ../sysdeps/unix/sysv/linux/pause.c:29 #1 0x000055a58c1a8e6f in main_loop () #2 0x000055a58c1b29a1 in main () which doesn't seem like it's doing much, and stats look ok: kamcmd> stats.fetch all { core.bad_URIs_rcvd: 0 core.bad_msg_hdr: 0 core.drop_replies: 0 core.drop_requests: 0 core.err_replies: 0 core.err_requests: 0 core.fwd_replies: 0 core.fwd_requests: 72 core.rcv_replies: 4134 core.rcv_replies_18x: 159 core.rcv_replies_1xx: 279 core.rcv_replies_1xx_bye: 0 core.rcv_replies_1xx_cancel: 0 core.rcv_replies_1xx_invite: 279 core.rcv_replies_1xx_message: 0 core.rcv_replies_1xx_prack: 0 core.rcv_replies_1xx_refer: 0 core.rcv_replies_1xx_reg: 0 core.rcv_replies_1xx_update: 0 core.rcv_replies_2xx: 3068 core.rcv_replies_2xx_bye: 68 core.rcv_replies_2xx_cancel: 39 core.rcv_replies_2xx_invite: 72 core.rcv_replies_2xx_message: 0 core.rcv_replies_2xx_prack: 0 core.rcv_replies_2xx_refer: 0 core.rcv_replies_2xx_reg: 975 core.rcv_replies_2xx_update: 0 core.rcv_replies_3xx: 0 core.rcv_replies_3xx_bye: 0 core.rcv_replies_3xx_cancel: 0 core.rcv_replies_3xx_invite: 0 core.rcv_replies_3xx_message: 0 core.rcv_replies_3xx_prack: 0 core.rcv_replies_3xx_refer: 0 core.rcv_replies_3xx_reg: 0 core.rcv_replies_3xx_update: 0 core.rcv_replies_401: 658 core.rcv_replies_404: 0 core.rcv_replies_407: 72 core.rcv_replies_480: 4 core.rcv_replies_486: 0 core.rcv_replies_4xx: 776 core.rcv_replies_4xx_bye: 2 core.rcv_replies_4xx_cancel: 1 core.rcv_replies_4xx_invite: 115 core.rcv_replies_4xx_message: 0 core.rcv_replies_4xx_prack: 0 core.rcv_replies_4xx_refer: 0 core.rcv_replies_4xx_reg: 658 core.rcv_replies_4xx_update: 0 core.rcv_replies_5xx: 0 core.rcv_replies_5xx_bye: 0 core.rcv_replies_5xx_cancel: 0 core.rcv_replies_5xx_invite: 0 core.rcv_replies_5xx_message: 0 core.rcv_replies_5xx_prack: 0 core.rcv_replies_5xx_refer: 0 core.rcv_replies_5xx_reg: 0 core.rcv_replies_5xx_update: 0 core.rcv_replies_6xx: 11 core.rcv_replies_6xx_bye: 0 core.rcv_replies_6xx_cancel: 0 core.rcv_replies_6xx_invite: 11 core.rcv_replies_6xx_message: 0 core.rcv_replies_6xx_prack: 0 core.rcv_replies_6xx_refer: 0 core.rcv_replies_6xx_reg: 0 core.rcv_replies_6xx_update: 0 core.rcv_requests: 2170 core.rcv_requests_ack: 210 core.rcv_requests_bye: 83 core.rcv_requests_cancel: 45 core.rcv_requests_info: 0 core.rcv_requests_invite: 196 core.rcv_requests_message: 0 core.rcv_requests_notify: 0 core.rcv_requests_options: 0 core.rcv_requests_prack: 0 core.rcv_requests_publish: 0 core.rcv_requests_refer: 0 core.rcv_requests_register: 1636 core.rcv_requests_subscribe: 0 core.rcv_requests_update: 0 core.unsupported_methods: 0 dns.failed_dns_request: 0 dns.slow_dns_request: 0 shmem.fragments: 270 shmem.free_size: 4283453736 shmem.max_used_size: 13711272 shmem.real_used_size: 11513560 shmem.total_size: 4294967296 shmem.used_size: 8167352 sl.1xx_replies: 0 sl.200_replies: 0 sl.202_replies: 0 sl.2xx_replies: 0 sl.300_replies: 0 sl.301_replies: 0 sl.302_replies: 0 sl.3xx_replies: 0 sl.400_replies: 0 sl.401_replies: 0 sl.403_replies: 0 sl.404_replies: 0 sl.407_replies: 0 sl.408_replies: 0 sl.483_replies: 0 sl.4xx_replies: 0 sl.500_replies: 0 sl.5xx_replies: 0 sl.6xx_replies: 0 sl.failures: 0 sl.received_ACKs: 0 sl.sent_err_replies: 0 sl.sent_replies: 0 sl.xxx_replies: 0 tcp.con_reset: 5 tcp.con_timeout: 54 tcp.connect_failed: 3 tcp.connect_success: 0 tcp.current_opened_connections: 44 tcp.current_write_queue_size: 0 tcp.established: 295 tcp.local_reject: 0 tcp.passive_open: 295 tcp.send_timeout: 0 tcp.sendq_full: 0 tmx.2xx_transactions: 3074 tmx.3xx_transactions: 0 tmx.4xx_transactions: 780 tmx.5xx_transactions: 0 tmx.6xx_transactions: 11 tmx.UAC_transactions: 1914 tmx.UAS_transactions: 3860 tmx.active_transactions: 1 tmx.inuse_transactions: 12 tmx.rpl_absorbed: 162 tmx.rpl_generated: 247 tmx.rpl_received: 4134 tmx.rpl_relayed: 3972 tmx.rpl_sent: 4219 } any ideas? thanks!, David Villasmil email: david.villasmil.work(a)gmail.com phone: +34669448337