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I can't achieve gigabit ethernet speeds!

R

rbaibich

Senior member
Hi everyone.

My network has a bunch of Macintoshes and a Dell PowerConnect 2724 connecting all the machines, a Buffalo Terabyte NAS and an internet router connected to a DSL modem. All the machines with gig-e have brand new cat6 cables installed. The switch recognizes them as being 1000T.

I just installed the whole thing, so I started to move a 149MB file between the machines. It takes 9 seconds to transfer from one machine to the other, 17s to transfer it to the NAS. What the heck!? According to this, that file should take 1.25 seconds to transfer over gig-e.

How can I troubleshoot this? Everything seems to be configured fine, but I just can't make it use all the bandwidth it has available.
 
How were you transferring the files?
How is the hardware you're using?
Is any one machine faster than the others?
Are you using jumbo frames?
 
How were you transferring the files?
How is the hardware you're using?
Is any one machine faster than the others?
Are you using jumbo frames?
Click to expand...

I tested connecting through Appletalk and through SMB. I'm getting the same speeds.
I'm using a G4 dual 800MHz and a G5 dual 2GHz.
The G5 is faster.
I'm not using jumbo frames because of the internet connection. I'm setting it up right now for testing purposes, we'll see what happens.
 
Even that link you pointed to tells you that those aren't real world numbers. You can't get close to real gigabit performance on most hardware (you've well saturated the PCI bus long before you get there). Without jumbo frames you'd be lucky to see a 50% improvement over 100mb connections (IMHE)

Bill
 
not gonna happen with desktop gear.

only hi-end servers (16+ procs, specialized I/O/mem/HD...read NOT PCI) can approach gigabit ethernet speeds. At gigE speeds the bottleneck is the hardware and the network itself is way faster.

desktop gear is really not made for super speed.

I've been watching your endeavor on this project and all I gotta say is be careful. You can't assume things will perform to what you read as speed. What you're trying to do is a "system" and all things work together. You will have a bottleneck somewhere but by going 1000 Base-T and a decent switch it will never be "the network"

A 1000 MPH highway doesn't do much for a car that can only go 200 MPH.
 
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