Are you running this on a Windows machine? If so, XP, Vista, or Win7?
Have you tried adjusting the TCP Window Size (Buffer) using the -w
command? Try -w 64k or higher.
Also, I'm in agreement with Gary. Your CPU processing power will limit
your max throughput.
Jimmy El Zorkani
From: Gary Gatten [mailto:ggat...@waddell.com]
Sent: Tuesday, June 21, 2011 2:19 PM
To: 'David J Hay'; iperf-users@lists.sourceforge.net
Subject: Re: [Iperf-users] Please help! Unexpected throughput for
gigabit
PS: are you really getting 30Mb/s and 90Mb/s, or are those typos? A
2002 laptop CPU is WAY too weak for Gig speeds, but it should be able to
do 80Mb/s no problem. With TCP you need to run the test for at LEAST a
few minutes due to TCP slow start.
________________________________
From: David J Hay [mailto:da...@thehays.com]
Sent: Tuesday, June 21, 2011 1:23 PM
To: iperf-users@lists.sourceforge.net
Subject: [Iperf-users] Please help! Unexpected throughput for gigabit
Hi,
Newbie here, to iperf and much networking.
Have upgraded my pc at home to gigabit adaptor (Intel Pro/1000 MT) and
was excited to hook up my laptop and run iperf to see the awesome 10x
speed increase ;)
With 100 mbps I averaged approx 30,000 Kbits/sec. When I reran with the
gigabit PCI adaptor, I only got up to about 90,000 Kbits/sec.
I really need some help figuring out why! I have checked cables and
they are Cat6 or Cat5e. The router is a high end Netgear (WNDR3700v2)
and the lights show green (gigabit). The laptop connection shows
gigabit, as does the pc. I ran all the tests that come with the desktop
adaptor, and they all pass.
This is an old PC - 2002 - Dell Dimension 8200. Can that affect things?
Where should I look now?
Please help!!
thanks,
David
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