Network Data transfer problem.

[thope]

i have an I-7 core and a c2d computer connected through an d-link 8-port switch. I have Broadcom, Intel, Realtek Nic's for the c2d @ pci and onboard pci express intel on the i7. when I use my macbook pro (marvell @ pci express) I get about 118 MB/s both ways but using the c2d desktop I can do 40 MB/s reception and 70 MB/s transmission with any NIC I use (realtek can do 80 MB/s transmission at times). can anybody try to make sense of it?

I forgot to mention, all the hardware is gigabit.

Rahul.

 

[00Roush]

What OSes are on all of the machines. When you say your macbook pro gets 118 MB/sec both ways which machine are you pushing/pulling data from?

00Roush

 

[thope]

All computer's are running windows 7. The results are the same wherever I test from. I am using windows file-sharing @ramdrive, iperf and ixia qcheck to test the network. all the tests give similar results.

 

[00Roush]

With iperf what command line are you using? Are you adding -w 64k to increase the window size from the default?

My guess is your mostly going to be limited by the PCI bus on your c2d computer. I have seen speeds similar to what you are experiencing on an older Athlon XP computer but it really depends on the motherboard. Just recently I put an Intel PRO/1000 MT PCI card in a my wife's computer (onboard PCI-e NIC died) and I still see speeds of around 100 MB/sec for file copies between computers. The other day I put one of the same cards in an emachine I was rebuilding and with iperf I saw speeds of 900+ Mbps (about 113 MB/sec) both in send and receive tests.

I have found that in some cases using a different PCI slot improves performance so you could try that.

00Roush