Asymmetric UL/DL on gigabit LAN?

[nicky9499]

Hi all,

The local network hardware in question:
CAT5E cabling
Netgear WNDR3700
Gigabyte Z77 (A) and MSI Z68 (B)
Windows 7 Ultimate x64 SP1 on both

I can upload from (A) to (B) and saturate 100% of my bandwidth (120+ MB/s). The other way round though, only ~60% of the bandwidth is used (~70MB/s). Test done using 15GB ISO and Windows copy.

Already ensured the following settings are same on both:

Energy Efficient Ethernet: Disabled
Jumbo Frame: 9Kb MTU
IPv6: Disabled
QoS: Disabled
Autotuning: Disabled
Speed & Duplex: 1Gbps Full Duplex
Large Send Offload: All Off

Can someone help me out here please?

 

[GokAy]

Try running AS SSD benchmark on the partitions that you are uploading to.

 

[nicky9499]

These are new 4TB WD Reds, 5400RPM. Their performance stats check out just fine.

 

[GokAy]

(Shouldn't affect much but) Same AV on machines?
Perhaps a cable with a faulty wire? What does the network connection property page (network and sharing center - local area connection) show as connection speed?

 

[nicky9499]

Both use the built in Firewall and Microsoft Security Essentials, nothing else. Task Manager reports the network connections as 1Gbps.

 

[GokAy]

Switch the cables around if possible or try a different cable for the problem PC.
I would also try a direct connection between the computers. Gigabit ethernet cards can communicate like that.

 

[nicky9499]

Hi, do you mean just turning the cable around or swapping it out? The latter's not really possible as it's the only 10m cable I have. Its routed through the house so anything to do with the cable is troublesome if I'm honest.

I could try a direct, to rule out issues with the router. The cable was newly installed 2 months ago and back then I had no problems saturating the bandwidth both ways.

 

[GokAy]

I guess a direct should suffice, if you get the same deal then swap the 10m cable around (if possible). As in PC A end to B, and PC B end to A.