FreeBSD TCP tuning and performance

Thu Dec 10 14:32:20 UTC 2009

This server is basically used for bandwidth testing (Our company is internet service provider) and we need and our clients something to measure a internet speed.

Actually on that server is hosted MyConnection SpeedServer (http://www.visualware.com/) for bandwidth tests. Some month ago we started to clients offer GPON with speed 500Mbit/500mbit.

While we offer DSL technology and speeds was up to 100Mbit it was pretty good results...but now we can't measure a speed on 1Gbps link...the results is very pure (almost half from real on FreeBSD).

This results aren't only with MyConnection..also with nuttcp and iperf...i have feeling, that FreBSD can't handle window size send/receive buffer

p.s maybe I should enable Network Pooling/disable interrupts on network card etc things? What could be a recommendations to set up for maximum performance TCP settings on 1/10Gbps interface with sysctl parameters?

Noisex

-----Original Message-----
From: owner-freebsd-performance at freebsd.org [mailto:owner-freebsd-performance at freebsd.org] On Behalf Of Steven Hartland
Sent: ceturtdiena, 2009. gada 10. decembrī 15:20
To: Noisex; freebsd-performance at freebsd.org
Subject: Re: FreeBSD TCP tuning and performance

What app are you using there and is it setting the send / receive buffers correctly?

----- Original Message ----- 
From: "Noisex" <noisex at apollo.lv>
To: <freebsd-performance at 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

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