On Tue, May 15, 2007 at 11:09:03AM -0700, Peter Hessler wrote: > you forgot to enable sysctl net.inet.ip.forwarding=1 on the first test. > Turn that on, then re-measure the speeds of the bridge. >
bridging is layer 2 and has nothing to do with net.inet.ip.forwarding=1. The problem is more somewhere deep inside the bridging code. One possible problem could be a to small interface queue but I could be totaly wrong. If nobody beats me I will have a look at this somewhen in the next month or so. > On 2007 May 15 (Tue) at 19:04:47 +0200 (+0200), Renaud Allard wrote: > :Hello, > : > :I just had the opportunity to test some Fluke network equipment, notably > :one which is able to throughput test gigabit networks. > : > :I installed a Nexcom NSA1086 with OpenBSD 4.1-stable and did some tests. > :The NSA1086 units are equipped with a Pentium IV 3.2Ghz (hyperthreading > :disabled), and 1Gb ram. They have 4 sk gigabit interfaces, and 4 msk > :gigabit interfaces. Here are the tests: > : > :********** > :ifconfig sk0 up > :ifconfig sk1 up > :ifconfig bridge0 create > :ifconfig bridge0 up > :brconfig bridge0 add sk0 > :brconfig bridge0 add sk1 > :sysctl kern.maxclusters=256000 > : > :Then I connected the fluke analyzers to both sk ports. connections were > :correctly seen at 1000 base T full Duplex. then I started a throughput > :test on 1Gbps, and I was extremely surprised to see how performance was > :very poor. The throughput was only about 77Mbps. > : > :*************** > : > :Seeing that I decided to try on msk interfaces and got about the same > :"performance". > : > :*************** > : > :Then I configured routing between two interfaces. > :ifconfig sk2 inet 192.168.0.1 255.255.255.0 > :ifconfig sk3 inet 192.168.1.1 255.255.255.0 > :sysctl net.inet.ip.forwarding=1 > :sysctl kern.maxclusters=256000 > : > :I did the throughput test, and got about 500Mbps both on sk and msk, > :with the CPU keeping quiet. > : > :************** > : > :So the weak performance doesn't seem related to the bus, the CPU, or the > :sk/msk drivers. Has someone an explanation on why I get this kind of > :behavior? > : > > > -- > Anthony's Law of Force: > Don't force it; get a larger hammer. > -- :wq Claudio
