Hello,Does anyone have similarly poor file copying performance on the Windows 7 Release Candidate as on Vista?I'm not very impressed with the performance of file copies. I'm running theWin7 64-bit RC, and over my wireless adapter, I can only copy files to a Windows 2003 server at ~5-600kb/sec, rather than a few megabytes per second, as I would expect on Windows XP.Thoughts?Trevor SullivanSystems EngineerOfficeMax CorporationTrevor Sullivan Systems Engineer OfficeMax Corporation

I meat with a simlar situation, file copy on windows 7 may be different to xp/vista, when i move one file on local disk to USB disk, it does not work(no speed promotas vista), and after some mins the copy done without any remain time announce

The responses in this post are completely inaccurate.The "Remote Differential Compression" feature simply installs a DLL for 3rd party developer use, and is not used by any in-box Windows features. It certainly does not affect file copy performance.Please read the blog below for clarification.http://blogs.technet.com/filecab/archive/2008/05/02/debunking-a-myth-about-remote-differential-compression.aspxAny perceived changes after disabling this feature are due to other changes - e.g. transient network conditions, or rebooting the system.Regards,Tom

Tom,Thank you for clarifying this. I'm not sure what would have been causing my slow file copy performance. I will report back to this thread if I experience further issues. If I get a chance, I'll do some testing.You certainly seem knowledgeable on this topic, so do you have any other insight into what could impact file copy performance?Thanks,Trevor SullivanSystems EngineerOfficeMax CorporationTrevor Sullivan Systems Engineer OfficeMax Corporation

Trevor,There are many factors that can affect copy performance, it's a complex area spanning many different components in the system. That said, we believe :) that Windows 7 file copy implementation is the best yet, and would certainly be interested to know if there are situations where you can consitently reproduce a worse result than XP or Vista.The most obvious potential variable in your case is that you are using a wireless connection. In my experience wireless bandwidth can vary significantly and quickly, which will make apples to apples comparisons very difficult unless you can control sources of interference etc in your environment. I'd also recommend making sure you're using the most up to date wireless nic drivers.One step you might try next time you are encountering problems is measuring the TCP level maximum bandwidth using a utility such as TTCP (http://en.wikipedia.org/wiki/Ttcp). This may help indicate whether the bottleneck is at the network layer or disk/fs/cifs layer.Regards,Tom

Tom,Thank you for the informative post.Here is some information about the setup I am using:Laptop: Dell Latitude E6400Wireless Card: Intel(R) WiFi Link 5100 AGNWireless Driver: Microsoft, 3/26/2009, 12.4.1.4OS: Windows 7 Release Candidate (build 7100)Wireless Infrastructure: CiscoWireless Signal: ExcellentLet me try out that TTCP program you mentioned, and see if I can get some metrics.I understand that there are a large number of variables doing file copies, especially over wireless, and even over copper, however I'm just interested in providing as much feedback as possible to help make Windows 7 better. Perhaps there isn't an issue here at all, but I'd expect to get a little better than ~30% usage of my wireless interface.Thanks,Trevor SullivanSystems EngineerOfficeMax Corporationhttp://trevorsullivan.wordpress.comTrevor Sullivan Systems Engineer OfficeMax Corporation

The other key piece if data is the number / file size distribution of the file set you are are copying.Regards,Tom

I copied a 500MB file using RaccoonWorks SpeedTest at an average of 1.5MB/sec. I couldn't find a download for the TTCP program.I'll have to test out a Windows XP system to compare results.Trevor SullivanSystems EngineerOfficeMax Corporationhttp://trevorsullivan.wordpress.comTrevor Sullivan Systems Engineer OfficeMax Corporation

So thats better than your original post, and not unreasonable for real world 802.11 b or g, with SMB 1.Please let me know if you believe you are really seeing consistently regressed performance here.Regards,Tom Development Manager, Windows Remote File Systems Team

Tom,I will post back once I get some results from XP-to-XP. I don't really use XP much anymore now that I've got the Win7 RC.Trevor SullivanSystems EngineerOfficeMax Corporationhttp://trevorsullivan.wordpress.comTrevor Sullivan Systems Engineer OfficeMax Corporation

Straight file transfer speeds seem OK and on par with XP. Massive improvement over Vista.Still seems to have problems with multiple netwerk transfersI have 3 machines all connected over gigabit ethernet. A and B are XP and C is win7.If A is playing a video from a network share on C then that video will halt completely if I try and copy a file from B to C using C to initiate the transfer. If I use B to copy the file to C then there is no issue.If A is playing a video on a share on B then I can initiate multiple network file copies with no interuption to playback.

Hello,I'd like to add my experience here with the file copy over network performance:3com Gigabit switch, domain networkTarget machine: vaio notebook with 2GB memory, windows rc1 7100, current updates, Office 2k7 Exnterprise, 100 MBit Ethernet on Marvell Yukon 88E8036 PCI-E Fast Ethernet Controller, set to 100 Duplex (not autonegotiating)Source machine: notebook w xp/sp3, current updates, Office 2k3 Pro, 100Mbit Ethernet on Realtek RTL8139/810x Family, set to 100 duplexSource Drive mapped to Z: on target machine. Source files are ntfs compressed.Explorer on Target machine (vaio) used to copy (right mouse click) files from source notebook, about 150 MBIt starts copying and gets slower (down to 3K after about 1 minute)and finally stops with a pop up window. Clicking "Repeat" causes it to continue but finally it fails. Traffic shows that it pauses longer and longer between a few packets.Turned off the remote compression feature on source machine and rebooted. No change in behavior. Slowness is reproducable even after reboot.Then used "xcopy z:\*.* e:\Gericom\*.* /S /E /F /H /R"This works now. Its not the fastest on the world but at least it does what it is supposed to do...It took 45 min for 151MB, 143 files, 14 FoldersQuite Slow isn't it?Any idea of how to speed this up??CheersKPEdit: ...............issue solved....................Never trust autonegotiation in the switch............Changed it to 100FD and it runs like a lightiningKP

I would like to add that I am having problems copying files to XP home from 7 looking at a gadget that measures network use Seven seems to copy one file at normal speed it then stops for a minute or 2 then copies the next file and so on. On my network I can copy normally between 7, Vista, 2000 and my NAS.

I cannot comment on the technical reasons but i have been doing some testing lately between windows 7 and windows server 2008 r2 with a gigabit network link (on the same switch) and to nas devices. It's only an old dell d820 with defautl drivers and RDC installed and this is what i found. Source initiated (i.e. copy to desitnation from source machine): 20~30mb/s (megabytes per second) to lacies networks space 2 drive (connected to bridged nic on local machine) 70-80mb/s to windows server 08 r2 or windows 7 box Destination initiated (i.e. copy source from the destination machine) 25~30mb/s from windows 7 to windows 7 or server 08 r2 (same code and drivers bascially no difference) 20-25mb/second from lacie to windows 7 box via bridged nic in second windows 7 device. (again all on the same core switch) hope this helps you understand file copy behaviour a bit, i know it's made me aware of a bit mainly always initiate the copy from the source and to the destination. :)

I have had a similar issue and it seems to be a problem with disk compression. With compression enabled 4.5MB/s without 40MB/s.