title: A-sync Speed over Gigabit LAN Ethernet File Transfer
body: <p>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.</p>
  
  <p>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.
  <a href="http://img189.imageshack.us/img189/6323/pc1y.jpg" rel="nofollow">Speed Test 1</a></p>
  
  <p>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)</p>
  
  <p>So what causes this?</p>
  
  <p>TIA</p>