Date: Mon, 7 Dec 2009 14:41:55 +0200 From: "Noisex" <noisex@apollo.lv> To: <freebsd-performance@freebsd.org> Subject: FreeBSD TCP tuning and performance Message-ID: <056c01ca773a$a88f69e0$f9ae3da0$@lv> In-Reply-To: <b8592ed80911300352n6e05be32l1435bb1b27ece071@mail.gmail.com> References: <4B108A18.207@truschinski.de> <B36EDB3F-79AB-4365-9E22-AA7A9E838393@gmail.com> <584ec6bb0911291330o11fba282y400e0abf121f5e7f@mail.gmail.com> <b8592ed80911300352n6e05be32l1435bb1b27ece071@mail.gmail.com>
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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
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