Date: Wed, 29 Mar 2006 13:04:26 -0300 (BRT) From: scuba@centroin.com.br To: freebsd-questions@freebsd.org Subject: Network tunning Message-ID: <20060329125019.V4053@trex.centroin.com.br>
next in thread | raw e-mail | index | archive | help
Hi all, I need some help to fine tune a mail server. The machine is running (Fbsd 5.4) for a long time, but I'm seeing too many connections droped in sendmail log, and some users complains about timeout connecting to smtp port. From the handbook I increased the kern.ipc.somaxconn to 1024 as sugested. Using "ps axH" shows about 350 processes. With "netstat -s -p tcp" worrys me the value of "listen queue overflows", is it normal? Bellow is the full output of netstat. What else can I use to track the problem? Thank you, - Marcelo Souza tcp: 299940903 packets sent 170887610 data packets (2229408012 bytes) 3195422 data packets (2540945914 bytes) retransmitted 122892 data packets unnecessarily retransmitted 9 resends initiated by MTU discovery 97048877 ack-only packets (7662921 delayed) 0 URG only packets 92888 window probe packets 24780412 window update packets 4041857 control packets 246506831 packets received 105676020 acks (for 1375023355 bytes) 12944539 duplicate acks 12456 acks for unsent data 72749271 packets (14818446 bytes) received in-sequence 8337796 completely duplicate packets (2516522316 bytes) 1814433 old duplicate packets 43730 packets with some dup. data (19627001 bytes duped) 56071043 out-of-order packets (3456612566 bytes) 2666 packets (3197931 bytes) of data after window 21 window probes 2895146 window update packets 60090 packets received after close 4802 discarded for bad checksums 1 discarded for bad header offset field 0 discarded because packet too short 972406 connection requests 2193450 connection accepts 379044 bad connection attempts 3508 listen queue overflows 15310 ignored RSTs in the windows 3103565 connections established (including accepts) 3166854 connections closed (including 337144 drops) 2617462 connections updated cached RTT on close 2658065 connections updated cached RTT variance on close 1857871 connections updated cached ssthresh on close 62026 embryonic connections dropped 94220002 segments updated rtt (of 81339570 attempts) 2752038 retransmit timeouts 42108 connections dropped by rexmit timeout 106133 persist timeouts 1378 connections dropped by persist timeout 49366 keepalive timeouts 705 keepalive probes sent 48657 connections dropped by keepalive 5490574 correct ACK header predictions 58517171 correct data packet header predictions 2363634 syncache entries added 665160 retransmitted 546143 dupsyn 0 dropped 2193450 completed 9240 bucket overflow 0 cache overflow 23559 reset 133854 stale 3508 aborted 0 badack 52 unreach 0 zone failures 0 cookies sent 33 cookies received 286560 SACK recovery episodes 586050 segment rexmits in SACK recovery episodes 816504390 byte rexmits in SACK recovery episodes 2640912 SACK options (SACK blocks) received 43198533 SACK options (SACK blocks) sent 0 SACK scoreboard overflow
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20060329125019.V4053>