Gigabit Speed Issue

[khulershaker]

Hi
Been trying to sort out a really weird issue that I can get sorted.

I set up my home network with a GIGABIT switch....
2 Desktops involved in sharing data which is why gigabit was chosen to help with speeds with big files.

One machine is win7 64 the other is XP pro sp3 both with Gigabit LAN cards.

IF I am on XP machine and copy files from WIn764, back to XP, I get TOP speeds.....
1000 mbs a seconds - few mins to copy GIGS of files - awsome!

However if I reverse it ....If I am on the win764 and send a big files to the XP machine, still operates at 100!!!!!!!!

I tried disabling IP6, trying with no firewalls, so much stuff but nothing changes it, the cable to the desktop is 25 meters and yet that doesn't explain why it works one way and not the other...I just got a new router with built in GIGAPORTS rather than chaining of a cheapo gig switch, to try and fix it, but no luck.

Any one seen this before? thanks

 

[Duke]

Which switch and network cards? Tried 4K jumbo frames on the network cards? AV slowing it down?

 

[Tomsk]

Can you reverse the cable?
If you can and the speeds are reversed, then it's a cable fault.

 

[whitecrook]

Try a different protocol eg FTP

 

[Qu3]

Just because your hdd can read at whatever speed doesn't mean it can write at that speed.
Google Iperf and check the performance of the network... chances are your HDD is the bottleneck not the network..

 

[khulershaker]

thanks for the tips guys I made iperf results from both directions - see what you think

client xp win764 server


win764 client xp server


FYI in regards to HDD perf, samsung F1's in raid 1 + SSD's In Raid 0 in win64 (same on tests for both)

On XP 1 x 2tb samsung F4 - copies from win764 at full throttle - wish I could get this working its faster than between 2 drives in the same machine LOL

 

[Qu3]

What does UDP say

Server -su
Client -u -b 1000MB -c 192.168.0.12

 

[Duke]

Tried with jump frames? It does help with GB networks.

 

[khulershaker]

right somethings come to light

in one direction I get

"warning did not recieve ack of last datagram in 10 retries"

in another............ I guess as to be expected on full gigabit.....

[156] 0.0-10.0 sec 1.25 MBytes 1.05 Mbits/sec 6.162 ms 0/ 893 (0%)
[156] Sent 893 datagrams

NB. Before this test I had just tried reversing the cable (house is a mess now as unrouted it from wall tacks etc)

looking like a honky cable? praps?

Tried jumbo frames , dsabling AV, all that jazz, same shizz guys :-/

 

[khulershaker]

Guys, latest, I took advice from whitecrook and set up a ftp server on both machines, and tested copying a video to and from the machines
guess what.... perfect gigabit in both directions! on both machines - WHAT THE FLIP?????

 

[whitecrook]

Guys, latest, I took advice from whitecrook and set up a ftp server on both machines, and tested copying a video to and from the machines
guess what.... perfect gigabit in both directions! on both machines - WHAT THE FLIP?????

This verifies that your wires, connection etc are all OK, you can copy at high speeds.

This now points the problem at windows file sharing etc. CIFS / or windows negotiating something etc. not sure where to look now..

... but theres a lot of results to search through on teh google: e.g.

http://www.windowsreference.com/win...-7-caused-by-remote-differential-compression/
http://social.technet.microsoft.com...f/thread/4537c7b6-9761-41c5-8b47-0ecb831c8575
http://answers.microsoft.com/en-us/...fer-slow/45bd0354-8ae1-4057-aa43-13f5a16b802d

 

[khulershaker]

thanks - tried tons of suggestions and got nowhere fast - in the end i put win 7 on instead of xp and both ways mega fast! gah! thanks though

 

[whitecrook]

Anecdotally , i have found quite a few weird problems like this with xp and either win7 or win2k8 server. I think it's really time to put xp to bed if you need to interoperate with these newer systems .