A-sync Speed over Gigabit LAN Ethernet File Transfer

Question

I have a strange problem with transferring files between 2 computers connected to each other through an ethernet cable. Both PCs have on-board gigabit ethernet ports. Aside from the different hardwares, the softwares (especially network settings) are configured almost the same, with Windows 7 x64 etc. Tests have been taken with and without antivirus programs running with no difference. Duplex settings are auto negotiation. Jumbo packets (~9MB) are enabled (usually I'm transferring really large files). Hard drives are not a problem, since local transfer speed within a computer is around 100 MB/s.

Now if I am on PC1, and accessing shared files on PC2: Transferring files from PC1 to PC2 is very fast, usually in the range of 60 MB/s (see results below from LAN SpeedTest). But the opposite (transferring from PC2 to PC1) is really slow, about 10 MB/s. Speed Test 1

If I am on PC2, and accessing PC1: Transferring files from PC2 to PC1 is slow (see speed test below - it's actually a little slower than when I'm transferring files and reading the speed report from Windows), while the opposite is fast (also about 60 MB/s like in the first case) (I would post link 2 here but it does not allow me to since I am new)

So what causes this?

TIA

Answer 1

This may be a silly question but when you say the computers are connected via an Ethernet cable do you mean directly connected or via a switch? If directly connected, are you using a crossover Ethernet cable or straight-through cable? If using a straight-through cable, I would say that one or both of the cards are failing to auto-sense if they have that capability. Also auto-duplex and auto-speed settings have been known to fail in the past, try setting them manually as well.