Q: Im trying to help a friend and thought that someone would be able to diagnose problem.
Here the info that he supplied.
Topology:
Cat 6 UTP cable, no more than run away from jack to jack 10m.
Drops to patch panels, test all cables from the workstation to fine.
Patch Jack patch panel to switch are all factory finished, nothing is an area terminated.
Switch Linksys Gigabit 8 port.
Workstations: WinXP Pro
All SP1a
Workstation 1: Intel Gigabit
Workstation 2: Realtek Gigabit (onboard)
Workstation 3: NVIDIA nForce 10/100 (onboard)
Here the problem:
Files moved from 1 to 3 WKS WKS WKS average 85 Mb/sec.
Files moved from 1 to 2 WKS average 250 Mb / sec.
Files moved from WKS 2-3 WKS 5 Mb/sec.
I average, a station of the WKS WKS 2 to 1 and then transfer at 85 Mb / sec of WKS WKS 1 to 3, but a direct transfer of 2 WKS to 3 WKS will never exceed 8 Mb/sec.
I have deleted / installed the adapter on 2 WKS a few times, run a utility to repair winsock settings, and updated the drivers with no effect. Because there is no problem transferring files from 2 to 1 WKS WKS, I do not think theres a problem with the adapter. I wonder if there is a cache or registry setting that is limiting the speed between 2 and WKS WKS 3.
If he puts one he can ftp files between 2 and 3 transfer of over 80 Mb / sec, but transfers through mapped drives average 8Mb / sec.
Any ideas?
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Re:Originally posted by: guy
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
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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Re: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
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Re:also, try different ports in the switch.
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Re: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.
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Re: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
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