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Transfers limited to 8Mb on a gigabyte network

Druidx

Druidx

Platinum Member
I'm trying to help a friend out and figured someone here would be able to diagnose the problem.

Here is the info he supplied.

Topology:

Cat 6 UTP cable, no runs longer than 10m.
Drops run from jack to jack to patch panel, all test fine.
Patch cables from workstation to jack and from patch panel to switch are all factory terminated, nothing is field terminated.
Switch is a Linksys Gigabit 8 port.

Workstations:
All WinXP Pro SP1a
Workstation 1: Intel Gigabit
Workstation 2: Realtek Gigabit (on board)
Workstation 3: Nvidia nForce 10/100 (on board)

Here is the problem:

Files moved from WKS 1 to WKS 3 average 85 Mb/sec.
Files moved from WKS 1 to WKS 2 average 250 Mb/sec.
Files moved from WKS 2 to WKS 3 average 5 Mb/sec.

I can map a drive from WKS 2 to WKS 1 and then transfer at 85 Mb/sec from WKS 1 to WKS 3 but a direct transfer from WKS 2 to WKS 3 will never get above 8 Mb/sec.

I have deleted/installed the adapter on WKS 2 a few times, run a utility to repair the winsock settings, and updated the drivers with no effect. Because there is no problem transferring files from WKS 2 to WKS 1, I don't think there is a problem with the adapter. I am wondering if there is a cache or registry setting that is limiting the speed between WKS 2 and WKS 3.

If he sets up an ftp he can transfer files between 2 and 3 well over 80 Mb/sec but tranfers through mapped drives average 8Mb/sec.

Any ideas?
 
What about files going the other direction (i.e., 3--->1, 2 ---->1, 3--->2)?

IF you're sure the cabling is terminated properly at the panels and jacks (no more than 3/8" exposed or untwisted, MBR maintained, no excessive pull tension, etc), then the next most likely suspects are usually the NIC drivers, contention on the BUS (try another slot for devices on the PCI bus), or other limiting hardware (hard drive xfer speeds, excessive swapping, etc).

FWIW

Scott


 
thats quite the stickler..

have you tried the forums of the websites for the nic vendors. In this case, nvidia or realtek?

There could be some sort of driver anomoly that there may be a fix for.
 
When the gigabit switches first hit the market, I remember reading that the real transfer rate would never hit the advertised speeds.

I remember that the reason was that the equipment was not able to properly handle large packets that would enable it to hit the speeds.

I think that the switch and the NIC hardware itself is not capable of reaching the advertised speeds except in controlled laboratory conditions
 
Originally posted by: alent1234
When the gigabit switches first hit the market, I remember reading that the real transfer rate would never hit the advertised speeds.

I remember that the reason was that the equipment was not able to properly handle large packets that would enable it to hit the speeds.

I think that the switch and the NIC hardware itself is not capable of reaching the advertised speeds except in controlled laboratory conditions
Click to expand...

well any gigabit nic should reach 10-20 megabytes/sec with today's hardware.

make sure you test in both directions with FTP. If it does fine with FTP but not mapped drives then you have some sort of a microsoft network/DNS problem
 
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