Slow windows copy/move in Win 7 over wired LAN
OK details main PC: win 7, e6600, asus P5 SLI board, onboard nforce 590 gigabit NIC x 2 Server: Dell SC440 WHS Gigabit NIC PCIe Switch: HP procurve 8 port 1400-8g All wired LAN Problem: copying files from win7 machine to server is SLow measures 3% 30Mbit/s of gigabit on task manager compare the same transfer with rich copy which runs at nearly 30% 300MBit/s and if LAN speedtest utility runs to give nearly 70% average 700MBit/s Or when the PC ran XP: 65% 650MBit/s Given the above I think it is a Win7 problem. If XP can manage 650 why cant win7? What I have tried: RDC disable - no improvement Update network drivers - no improvement Transfer files either way - no improvement Disable AutoTuning - no improvement Safe mode transfer during this tme I have had some change, but none that I can repeat. I had a windows copy transfer whose rate fluctuated wildly between 3% & 90%... I am very reluctant to do a reinstall as this seem s to be the only problem I have wit 7 ATM Reinstall being the cure in the following thread:- http://social.technet.microsoft.com/Forums/en/w7itpronetworking/thread/c30f6649-a0d9-4f5e-8671-904a8f5469bb All help gratefully received jon
March 22nd, 2010 11:41pm

If you're copying to/from an older system (i.e., a system other than Windows 7) - or even if you aren't - try disabling Remote Differential Compression: 1. Control Panel - Programs and Features.2. Click the Turn Windows features on or off link at the upper-left.3. Uncheck [ ] Remote Differential Compression. Worth a shot. -Noel
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March 23rd, 2010 6:09pm

Hi, Based on my research, I would like to suggest the following: 1. Temporarily remove your firewall and anti-virus software and have a try. 2. Try disabling Receive Side Scaling, Chimney Offload, and NetDMA support and see if it works: Information about the TCP Chimney Offload, Receive Side Scaling, and Network Direct Memory Access features in Windows Server 2008 3. Try Robocopy: For detail information about the usage of the Robocopy command, please also refer to: Robocopy 4. If all the computers are connected to a router, please also update the router’s firmware. Hope this helps. Thanks. Nicholas Li - MSFT
March 25th, 2010 11:53am

Hi I tried disabling Remote Differential Compression, but to no avail. I'd never heard of copy utililities until a week ago, when I tried richcopy. I cant figure out why richcopy is that much quicker than windows own copy... @ Nicholas: do you mean to do that on the Home server? or the Win7 PC. I have disabled Receive Side Scaling and Chimney Offload on the Win7 PC with no change. both computers are connected wired to the HP switch. I just assume it's some setting/tickbox that I have failed to find thus far... jon
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March 25th, 2010 11:54pm

I'd just like to add that I can easily saturate a 100 base T connection in my home LAN with simple drag and drop file operations in Explorer between computers. I have copied terabytes this way. I only mention this because you want to keep the mindset that something's more likely wrong on your specific system rather than something systemic that needs configuring to work. One thing did occur to me: I have completely disabled HomeGroup networking. It's not needed for networking (my LAN is thus like a workgroup network at work). Best of luck. -Noel
March 26th, 2010 12:44am

Hi, Thank you for your update. Please try the first 3 suggestions on the Windows 7 computer. As the suggestion doesn’t help, please also try others. Thanks. Nicholas Li - MSFT
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March 26th, 2010 5:47am

Ok I've not had time to do anything, but now a transfer in windows explorer does ~750 Mbit/s for 15 secs then 25 secs at ~60 Mbit/s,, which is obviously better. But what's causing the fluctuation? Any ideas any body. All suggestions gratefully received, as always. Jon
March 28th, 2010 11:31pm

What kinds of files are you copying? Many small files or a few large files? There's some end to end interaction with the creation of each new file, so copying a large block of small files can cut into throughput. -Noel
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March 30th, 2010 9:17pm

I have the same problem with file copying. When I copy large files to a network drive it's really fast. But when start copying small files, 10 or 10000 whatever, it's really slow. Only a few kb/s will transfered. Hope anybody have an idea or solution for that problem.
April 12th, 2010 12:04pm

I have been through all this just now, i was capped at 2.5mbs on a gigabit lan connection via a laptop and a pc both with windows ultimate 7 runing. I tried everything and then realised that even though i had turned off avast and comodo ect i had managed to completly overlook the built in windows firewall. I tirned it off and hey presto i was up to 10x at 25 meg a sec. Not blazing but a ____ of a lot better. I was almost pulling out my hair and to think it was something simple as it always is. :)
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October 26th, 2010 4:59pm

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