R52 Broadcom LAN Speed Problem

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robo47 · #1 Post by **robo47** » Mon Feb 05, 2007 6:34 am

I currentry have a problem with my R52 using a Gigabit-Connection with the onboard Broadcom Netextreme Gigabit LAN-Card, i don't get a really gigabit-like throughput.

I tested the Connection to:

- Intel PRO/1000 CT and Intel PRO/1000 MT (Onboard in my Servermainboard [Supermicro P4SCI])
- R52 with same Broadcom-Card [almost same model, just bigger CPU, better TFT and Fingerprint-reader]

tested with different cables, even a cross-over (which isn't needed on Gigabit)

The Max-Value i get on Networktransfers is a 6% load [about 6 mb/s max] , the Cards both say, they are connected with 1000Mbits.

Something which was surprising me, was the Process "system" is running between 60 and 95% load. The Networkload is jumping while transfer from 0% to 6%, no really "stable" performance.

I tried to kill all other processes, programms (firewall, virus-scanner, even all other ibm-programms like Access Connections) but no change.

Then i tested with a driver direct from the Broadcom-Homepage, same results, no gain in Speed.

One thing i saw, was suprising me too, in the Hardware-Settings of the Broadcom-Card the point "Speed & Duplex" only has these possible Values:

10 Mb Full
10 Mb Half
100 Mb Full
100 Mb Half
Auto

No 1000 Mb Setting(s)

Other Informations:
I always was conntect to power, Energie-setting was Max Power.

Anybody has some more Ideas what i can do ?

greetz
robo47

robo47 · #2 Post by **robo47** » Tue Feb 06, 2007 4:05 pm

Nobody an idea ? Probably the Broadcom ist just no good gigabit-card ?

Wayne · #3 Post by **Wayne** » Sun Feb 18, 2007 2:27 pm

It'll never happen. Those speed ratings are in perfect laboratory conditions transmitting a specific amount of data. In real life you'll never get the advertised speed. Here is a little something from another forum that I posted:

There have been several questions lately about network speed. I thought I'd just test it. I have my home network wired (100 Mb/s) and wireless G (54 Mb/s). Wired are two home builts running XP Home, 2 Gig processors, a Gig of RAM each. Wireless is my IBM ThinkPad R-40 P4 2.2 Gig processor, 768 Meg of RAM with an Intel BG2200 wireless card.

My test was to move a large file, just one single file, not a bunch of small files, from one machine to the other. I chose a copy of SP-2, 266 Meg in size. Theoretically the wired connection should have taken close to 2.6 seconds and the wireless around five. Not so. The results:

Wired - 30 seconds.
Wireless - 100 seconds.

As I've stated in previous posts, those advertised speeds are in perfect laboratory conditions.

Humbly submitted,

Wayne

robo47 · #4 Post by **robo47** » Sun Feb 18, 2007 5:20 pm

I now tested a knoppix-cd and trying it on linux and speeds between 25-30mb/s on a single-file-copy and 35-40mb/s when doing 2 transfers, seems my windows sucks a bit, will try to reinstall, if it doesn't do at more speed than currently on windows, think it will be a call to lenovo, because why should i buy a gigabit adapter when it does not even get 100mbit speed on a direct connection in windows ?

Wayne · #5 Post by **Wayne** » Sun Feb 18, 2007 8:50 pm

but don't hold your breath.

Wayne · #6 Post by **Wayne** » Sun Feb 18, 2007 9:06 pm

Don't forget about your hareware speed. No way a hard drive can send or receive as fast as the connection might be. Example, if the transfer (read/write) speed of a given hard drive is 20 Mb/s, what do you think the LAN speed will be?

Wayne

robo47 · #7 Post by **robo47** » Mon Feb 19, 2007 3:19 am

Wayne wrote:Don't forget about your hareware speed. No way a hard drive can send or receive as fast as the connection might be. Example, if the transfer (read/write) speed of a given hard drive is 20 Mb/s, what do you think the LAN speed will be?

Wayne

i know it can't be faster, but for sure faster than my current speed

robo47 · #8 Post by **robo47** » Mon Dec 22, 2008 4:20 am

It may be late, but after switchting to GNU/Linux (first ubuntu 8.04, then 8.10) my Gigabit now works like it should.

With iperf i get values of about 90mb/s, cpu doesn't go crazy like under windows und the limiting factors for the speed over netzwork is now the read/write-speed of the harddisks on both sides (my server and my thinkpad).

Code: Select all

iperf -c 192.168.178.37 -P 1 -i 1 -p 5001 -f M -t 10
------------------------------------------------------------
Client connecting to 192.168.178.37, TCP port 5001
TCP window size: 0.09 MByte (default)
------------------------------------------------------------
[  3] local 192.168.178.45 port 54560 connected with 192.168.178.37 port 5001
[  3]  0.0- 1.0 sec  92.5 MBytes  92.5 MBytes/sec
[  3]  1.0- 2.0 sec  93.0 MBytes  93.0 MBytes/sec
[  3]  2.0- 3.0 sec  89.0 MBytes  89.0 MBytes/sec
[  3]  3.0- 4.0 sec  93.4 MBytes  93.4 MBytes/sec
[  3]  4.0- 5.0 sec  92.9 MBytes  92.9 MBytes/sec
[  3]  5.0- 6.0 sec  92.5 MBytes  92.5 MBytes/sec
[  3]  6.0- 7.0 sec  88.5 MBytes  88.5 MBytes/sec
[  3]  7.0- 8.0 sec  92.7 MBytes  92.7 MBytes/sec
[  3]  8.0- 9.0 sec  90.3 MBytes  90.3 MBytes/sec
[  3]  9.0-10.0 sec  89.8 MBytes  89.8 MBytes/sec
[  3]  0.0-10.0 sec    915 MBytes  91.4 MBytes/sec
Done.

That is how it should be

R52 Broadcom LAN Speed Problem

R52 Broadcom LAN Speed Problem

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