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Old 11-03-2010, 02:29 PM   #1
Registered: Jun 2005
Location: Earth
Distribution: Ubuntu10.04
Posts: 308

Rep: Reputation: 43
lan speed to low for Gbit connection

Recently I established a share connection between an ubuntu 10.04 server and a windows 7 workstation.
The shared folder is on the win computer, and most traffic goes from server to workstation.
Both computers have Gbit nics and both have a lan connection to a Gbit router.
The speed of file transfers is disappointing, just 110Mbit. My internet connection has 120Mbit bandwidth and very often I reach 150Mbit.
I have tested my share connection with Iperf:
root@server:~# iperf -c -w 2m
Client connecting to, TCP port 5001
TCP window size:   256 KByte (WARNING: requested 2.00 MByte)
[  3] local port 33442 connected with port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  1013 MBytes    850 Mbits/sec

root@server:~# iperf -s
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
[  4] local port 5001 connected with port 55775
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  1.09 GBytes    933 Mbits/sec
In my humble opinion these test results look great, but question is what can be limiting my bandwidth.
The share connection uses samba cifs.
I am awfully inexperienced with network connections.
Old 11-14-2010, 03:08 AM   #2
Registered: Nov 2008
Location: Lower Saxony, Germany
Distribution: CentOS, RHEL, Solaris 10, AIX, HP-UX
Posts: 731

Rep: Reputation: 137Reputation: 137

samba/cifs by itself is somewhat slow, also using a raw transfer tool will be faster than a filesystem based share software, because raw data transfer has not to do filesystem operations like setting up fs-information and metadata. Also small file operations are slower than transfering large files.

900Mbit/s is not a real value, because Gigabit network is not real 1000MBit, it is from my experience around 300MBit, so i think both values are somewhat wrong.

Last edited by mesiol; 11-14-2010 at 03:10 AM.


bandwidth, cifs, iperf, samba

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