Slow interconnectivity

cheechm · 21 May 2011 at 14:39

Setup is as follows:

Server: Dell Poweredge 1950 Server with dual Broadcom gigabit network card
Switch: HP Procurve v1910 gigabit switch
Client: Custom build with Marvell gigabit network card

Running JPERF between them I get this result:

Click here - big image

Anyway, not sure why this is happening. Jumbo frames enabled on all devices etc... Checked all firewalls (OFF for testing).

There is no other traffic on the switch, so its quite confusing.

Any ideas?

23JMZ07 · 21 May 2011 at 15:02

What is the speed going the other way?

i.e. swap client and server in Jperf

cheechm · 21 May 2011 at 15:34

Other way

23JMZ07 · 21 May 2011 at 17:51

Even with overheads that is stupidly slow. Its probably a Windows problem.
Can you set up an ftp server on the server and see the transfer speeds over that protocol?

cheechm · 22 May 2011 at 18:51

I get the same speed which is odd! Not sure what could be the problem.

lightning512 · 23 May 2011 at 00:01

Try putting parallel streams to 5, as I just used the program and got about the same results as you with just 1, but set to 5 it went up to 800 Mbits.

cheechm · 24 May 2011 at 10:45

Tried that and got the same results, however thats not what occurs in reality, so the speed is just the same.