File copying speed drops

[Meehael]

Hello,

I have two computers in a LAN, both have Win7 64 bit. They're connected through a router. When I want to copy a file (about 2GB) from one comp to another, the copy speed starts at about 10MB/s which is great since I have 100Mbit LAN card, but after about a minute it drops down to about 3MB/s. I tried restarting copying, restarting coputers, but each time after about a minute, the copy speed drops down to 3MB/s. I used windows Resource Monitor to see what is happening, and I noticed that when the copying speed drops, the network begins to fluctuate/oscillate like crazy. Don't know if that is the cause or consequence. No one was downloading anything during the time I tried to copy the file.

I have Intel i3 2120, 4GB DDR3 1333MHz, MSI GeForce 560GTX 1GB, WD 2TB, ASUS P8H61Pro. Avast antivirus, and not many applications or programs installed, just the "essential" ones.

Thank you for your help

 

[Rifter]

terracopy, use it.

Stock windows file transfer program/network code blows, alot.

http://codesector.com/teracopy

 

[Ferzerp]

Does your target parhaps have a motherboard managed RAID5 array with no caching?

 

[Gunbuster]

This is one single file right? Windows is horrible at large numbers of small files...

 

[Meehael]

I tried Teracopy. The results are the same.

I've made some more interesting tests. When I copy from the desktop PC to the laptop, copy rate is great, about 30MB/s, but when I copy from the laptop to the PC, the copy rate is only about 3MB/s. I even tried connecting them directly via network cable, bypassing the router. Results are the same. I have two disks on the PC, one is a system disk 250GB, the other is storage 2TB.

Yes, it's one large file. Don't know about RAID. Never used it. Can I set something in the PC's BIOS?

Thanks

 

[Meehael]

I think I found out what was the problem. In BIOS, under SATA Configuration, I set SATA Mode from IDE to AHCI, and now the copy speed is about 12 MB/s the whole time.

Thanks for the ideas!

 

[Meehael]

And if I connect them directly (bypassing the router), I get speeds of about 50-100MB/s. Both computers have 1Gbit LAN cards, after all. So, I guess the router was a bottleneck?

 

[ViRGE]

And if I connect them directly (bypassing the router), I get speeds of about 50-100MB/s. Both computers have 1Gbit LAN cards, after all. So, I guess the router was a bottleneck?

I'd say so. WAN <-> LAN throughput is always a concern on routers, but some older models have been known to have similarly poor LAN <-> LAN throughput.

 

[Meehael]

Maybe this should be a post for hardware section, but I'll continue asking here. I have a Thomson TG782 router and it says that its LAN interface uses "4-port autosensing 10/100Base-T auto-MDI/MDI-X Ethernet switch". From the looks of it, I'd say its top speed is 100Mbps?

 

[Weltschmerz]

Try disabling Remote Differential Compression. With this feature enabled, the systems only use the required resources necessary to transfer files across networks, thereby can possibly handicap maximum transfer speed.
To disable this feature, go to Control Panel -> Programs and Features -> Turn Windows features on or off, uncheck Remote Differential Compression and reboot. Disabling this feature does no harm and it might solve your problem. No guarantee though.

 

[frowertr]

Maybe this should be a post for hardware section, but I'll continue asking here. I have a Thomson TG782 router and it says that its LAN interface uses "4-port autosensing 10/100Base-T auto-MDI/MDI-X Ethernet switch". From the looks of it, I'd say its top speed is 100Mbps?

I'd say you are correct!