10Gb iPerf kit?

Roy Hirst rhirst at xkl.com
Mon Dec 8 16:29:10 UTC 2014

Can't help with faster adapters, but I believe there are some underlying 
architectural issues here as to why the speeds are hard to achieve, and 
why some people can and others maybe can't achieve them.
For Carrier Ethernet, I believe most of these are covered in RFC2444 and 
the related RFC6815. Even with bit speeds up to spec, traffic speeds are 
impacted non-linearly by customer protocols including the usual suspect, 
TCP. This is documented in ITU-T Y.1564, clearly enough for simple folk 
like me. A good example for your corkboard is slide (page) 28 of the 
excellent 20140409-Tierney-100G-experience-Internet2-Summit.pdf, 
included as part of a report on 100GE performance test methodologies. 
Which is how I stumbled across it.

*Roy Hirst* | 425-556-5773 | 425-324-0941 cell
XKL LLC | 12020 113th Ave NE, Suite 100 | Kirkland, WA 98034 | USA

On 12/7/2014 8:48 AM, Teleric Team wrote:
>> From: pete at fiberphone.co.nz
>> Subject: Re: 10Gb iPerf kit?
>> Date: Sun, 7 Dec 2014 09:24:41 +1300
>> To: nanog at nanog.org
>> On 11/11/2014, at 1:35 PM, Randy Carpenter <rcarpen at network1.net> wrote:
>>> I have not tried doing that myself, but the only thing that would even be possible that I know of is thunderbolt.
>>> A new MacBook Pro and one of these maybe: http://www.sonnettech.com/product/echoexpresssel_10gbeadapter.html
>> Or one of these ones for dual-10Gbit links (one for out of band management or internet?):
>> 	http://www.sonnettech.com/product/twin10g.html
>> I haven't tried one myself, but they're relatively cheap (for 10gig) so not that much outlay to grab one and try it (esp if you already have an Apple laptop you can test with).
> How would you use it? with iperf still?I don't think you will go nearly close to 14.8Mpps per port this way.Unless you are talking about bandwidth testing with full sized packet frames and low pps rate.
> I personally tested a 1Gbit/s port over a MBP retina 15 thunderbot gbe with BCM5701 chipset. I had only 220kpps on a single TX flow.Later I tried another adapter with a marvel yukon mini port. Had better pps rate, but nothing beyond 260kpps.
>> I've done loads of 1Gbit testing using the entry-level MacBook Air and a Thunderbolt Gigabit Ethernet adapter though, and I disagree with Saku's statement of 'You cannot use UDPSocket like iperf does, it just does not work, you are lucky if you reliably test 1Gbps'. I find iperf testing at 1Gbit on Mac Air with Thunderbolt Eth extremely reliable (always 950+mbit/sec TCP on a good network, and easy to push right to the 1gbit limit with UDP.
> Again, with 64byte packet size? Or are you talking MTU?
> With MTU size you can try whatever you want and it will seem to be reliable. A wget/ftp download of a 1GB file will provide similar results, but I dont think this is useful anyway since it won't test anything close to rfc2544 or at least an ordinary internet traffic profile with a mix of 600bytes pkg size combined with a lower rate of smaller packets (icmp/udp, ping/dns/ntp/voice/video).
> I am also interested in a cheap and reliable method to test 10GbE connections. So far I haven't found something I trust.
>> Pete

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