It COULD be a cable, but more likely CPU/hardware/drivers/TCP tuning, etc.
With "crappy" gear you should be able to get 50% of line speed. With good
100Mb/s you should get 90% or better, with 1Gb you should get 70% or better.
It's not just about throughput, it's about pps. Most devices don't like high
pps rates.
Run your tests with UDP, packet size of 1300 bytes, 64K buffer. Watch your
CPU's.
G
________________________________
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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