Downloading faster than Uploading....

I have two computers running WinXP Pro with gigabit NICs connected with a crossover cable.
The strange thing is that when uploading a file the speed seems to be limited to 100mbps but, downloading the same file I get 200mbps.

I've tried several combinations:
1 - Only tcp/ip with hosts file.
2 - Only netbios with lmhosts file.
3 - Nwlink - unbearable low speed, and
4 - The "regular" Netbios over tcp/ip. This seems to be the fastest option.

Does anyone know why downloading is faster than uploading?

Is there any parameter I can tweak to get better performance?

The NICs are Level One GNC-0105T model and I'm using Cat6 cable.

Thanks!

 

You dont need entries in your hosts files. Use TCP/IP remove QoS and NetBIOS. Also check your network card connection speed. Set the card to full duplex. Also a thing to know Gig LAN will move data at 120MB/s at burst more consistantly at 95MB/s. The other thing is Windows uses a smaller upload window size. The way windows does a file transfer is really slow and inefficient. Are both computers the same hardware wise? You could be running into hardware latency. If you are just transfering files use a FTP server (filezilla server) its really easy to configure.

 

What type of file?

I believe (though not positive) if it's a compressed file like an mpeg it has to be decompressed and recompressed on the other end. a 750 meg file might be 10 gig uncompressed.

 

As I said before I tried all combinations of TCP/IP and Netbios and the fastest is Netbios over TCP. It gives me 20% network utilization, around 200 Mbps (megabits/second) ~ 25MBps downloading.
I transfer mostly very large (4.4GB) .TS files to my HTPC. Some films like Private Ryan are as big as 24GB, wich I divide into 4.4GB files to backup them in DVDs. This particular film takes 1 hour to transfer over a 100mbs link.

 

Just for kicks and giggles can you get your hands on a gigabit switch and put inbetween?

I have 2 gigibit PCs here and a gig switch. I'll see what I get tonight.

 

Yes, I tried an Encore 8 port gigabit switch. It supports jumbo frame 9k and 12k, and a Dlink 1008 switch - no jumbo frame supported.

Results were the same.

Funny it seems that the OS is limiting the bandwidth to 100mps cause it stops exactly at 10% network utilization, cpu doesn't go above 20% utilization.
If the problem was the hardware downloading would be limited to the same speed, but I get 20% network utilization while downloading a file, cpu goes up to 55% utilization.