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Slow File Write From Windows 7 to SMB server

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We are currently upgrading from Windows Xp to Windows 7 and we came across a wierd problem. 

We got a Program that can export DB to HTML format. When we start the process it write the new file line by line. 

If we save the file to HDD we got 1 min time wait, To netwok share from other win7, about 2 mins. Thats normal! 

If we pick the same pc and write it to a samba server (Server or linux workstation share) it takes about 60 mins to copy the same files. 

Here's the strange part, we dont have the same problem on XP station. This is new with the Windows 7 workstation. 

We used a sniffer to know more and we fount that on XP it open a transfert and send about 4 or more data packet each time of about 1500bytes. On windows 7 it connect, transfert 1 to 30 bytes and then start a new transfert. 

At first we look at Opportunistic locking, and disabling it double the transfert speed but we are still at 30 mins transfert for about 5 MB. 

This does'nt happen on big file transfert, only in line by line file generation over a Network to an SMB share. 

Thanks for the future help!


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