Date: Thu, 10 Dec 2009 13:19:46 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Noisex" <noisex@apollo.lv>, <freebsd-performance@freebsd.org> Subject: Re: FreeBSD TCP tuning and performance Message-ID: <4ADA4DF6401E47F6A0FE26890B50FBB1@multiplay.co.uk> References: <4B108A18.207@truschinski.de> <B36EDB3F-79AB-4365-9E22-AA7A9E838393@gmail.com> <584ec6bb0911291330o11fba282y400e0abf121f5e7f@mail.gmail.com><b8592ed80911300352n6e05be32l1435bb1b27ece071@mail.gmail.com> <056c01ca773a$a88f69e0$f9ae3da0$@lv>
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What app are you using there and is it setting the send / receive buffers correctly? ----- Original Message ----- From: "Noisex" <noisex@apollo.lv> To: <freebsd-performance@freebsd.org> Sent: Monday, December 07, 2009 12:41 PM Subject: FreeBSD TCP tuning and performance Hi! I have a problem with TCP performance on FBSD boxes with 1Gbps net i-faces (Broadcom NetXtreme II BCM5708 1000Base-T (B2)). Currently i use FBSD 7.1 AMD64. The test lab: 2 x (server-client) HP Proliant G5 DL360 (quad-core/8gb ram, raid 5 SAS). For net benchmark i used nuttcp and iperf. The servers (client-server) are in 1 VLAN. The results on 1Gbps (down & up): 63.4375 MB / 1.00 sec = 532.1332 Mbps 64.3750 MB / 1.00 sec = 540.0426 Mbps 62.8125 MB / 1.00 sec = 526.8963 Mbps 64.5625 MB / 1.00 sec = 541.6318 Mbps 63.9375 MB / 1.00 sec = 536.3595 Mbps 63.7500 MB / 1.00 sec = 534.7566 Mbps 63.0000 MB / 1.00 sec = 528.5003 Mbps 63.5000 MB / 1.00 sec = 532.7150 Mbps 64.0000 MB / 1.00 sec = 536.8586 Mbps 63.5625 MB / 1.00 sec = 533.2452 Mbps 637.6688 MB / 10.02 sec = 533.9108 Mbps 9 %TX 9 %RX 9 host-retrans 0.67 msRTT 25.5625 MB / 1.00 sec = 214.3916 Mbps 30.8750 MB / 1.00 sec = 259.0001 Mbps 29.9375 MB / 1.00 sec = 251.1347 Mbps 27.1875 MB / 1.00 sec = 228.0669 Mbps 30.5000 MB / 1.00 sec = 255.8533 Mbps 30.2500 MB / 1.00 sec = 253.7551 Mbps 26.8125 MB / 1.00 sec = 224.9211 Mbps 30.3750 MB / 1.00 sec = 254.8047 Mbps 30.3750 MB / 1.00 sec = 254.8050 Mbps 30.0625 MB / 1.00 sec = 252.1835 Mbps 292.2155 MB / 10.02 sec = 244.6825 Mbps 10 %TX 12 %RX 0 host-retrans 0.71 msRTT As you can see down is littlebit more than half of full link speed. And upload is only 20-25% of full link. I tried to change a lot sysctl params but without a big results. Currenlty my entries in /etc/sysctl.conf which regarding to TCP: #kernel tuning, tcp kern.ipc.somaxconn=2048 kern.ipc.nmbclusters=32768 kern.ipc.maxsockbuf=8388608 net.inet.tcp.sendbuf_max=16777216 net.inet.tcp.recvbuf_max=16777216 net.inet.tcp.inflight.enable=0 net.inet.tcp.sendspace=65536 net.inet.tcp.recvspace=65536 net.inet.udp.recvspace=65536 net.inet.tcp.inflight.enable=0 net.inet.tcp.rfc1323=1 net.inet.tcp.sack.enable=1 net.inet.tcp.path_mtu_discovery=1 net.inet.tcp.sendbuf_auto=1 net.inet.tcp.sendbuf_inc=16384 net.inet.tcp.recvbuf_auto=1 net.inet.tcp.recvbuf_inc=524288 Do you have some kind suggestion what i could to change to increase the performance of TCP? Besides when i make the benchamrks i run the sniffer to see whats happening with network..sometimes i saw that window size is 0...does it mean that server can't handle something or recieve buffer size is to small? p.s sory for my bad english :) Noisex _______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org" ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.
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