Hi all First I would like to apologise everybody for my bad English ;) I am actually trying to configure 10 gbe link between two pcs to make it work with desirable bandwidth - let's say 4 gb/s at least. I have already tested it with two Linux systems, and after some tcp/ip parameters tuning I finally succeed - bandwidth is OK - iperf showed about 8 gb/s over udp, no packet loss. That is why I believe that ethernet NICs I use are OK. The problem appears when I try to do the same with Windows7 installed on one machine instead of Linux. Then bandwidth is really poor - about 400 Mb/s over udp max, tcp is also poor - 500 Mb/s. My question is what I should configure under Windows to make it work better, and how I can do it. When I was trying to perform connection between Linux systems then I changed network stack parameters to make it work better. These parameters was like "default udp buffer size", "max udp buffer size" etc. I believe that I should do the same on Windows but the problem is that I have no idea where I can set such a parameters under Windows. In fact I am not sure if it is possible at all. NICs that I use are "Intel 10 Gigabit XF SR PCIe" on Windows and "Sun Multithreaded Dual PCIe" on Linux. Has any of You ever tried to configure Windows7 to work on gigabit speeds? Any ideas? Step I have already performed on Windows7 which did not solve my problem: -disabling any firewall/antivirus software -installing latest NIC drivers

Can your hard drive even keep up with those speeds? You're only going to go as fast as your weakest link.Matt W. CCNP, CCSP, CCDA, RHCT, MCSE, MCSA, MCP+I, A+

I am performing tests using iperf so it does not involve any hard drive operations. As I said - with Linux on two machines I got 8 Gb/s bandwidth over udp, and moer than 9 Gb/s over tcp, using iperf. That is why I do know that it is possible to get such a high bandwidth, at least using Linux.