Edu versus Speakeasy Speedtest

Thu Apr 29 16:10:44 UTC 2010

Agreed.  Most of the sites are not accurate for large bandwidth locations.  Speedtest.net is flash based, however I find that slightly more accurate up to about 50-100mbit range.

-----Original Message-----
From: Bret Clark [mailto:bclark at spectraaccess.com] 
Sent: Thursday, April 29, 2010 10:05 AM
To: nanog at nanog.org
Subject: Re: Edu versus Speakeasy Speedtest

All the new OS's (IE Windows7) automatically adjust TCP window size.

Personally I've never found those website speed test to be that accurate on fast connections (over 15Mbps full duplex).  The only way to really confirm bandwidth is by running IPERF.

Robert Glover wrote:
> Adjust your TCP window size.
>
> -----Original Message-----
> From: "Murphy, William" <William.Murphy at uth.tmc.edu>
> Date: Thu, 29 Apr 2010 10:53:01
> To: nanog at nanog.org<nanog at nanog.org>
> Subject: Edu versus Speakeasy Speedtest
>
> I work for an Edu with multi-gigabit Internet connectivity and I get 
> questions from users saying "Why am I only getting 14Mb when I run 
> this speed test?"  I have got to believe that the various Internet 
> speed tests (Speakeasy or dslreports) are rate limited to prevent 
> someone from shutting them down.  I am able to get 300-400Mb running 
> from a PC inside my network to NDT servers located on Internet2, so 
> that tells me my border and internal network is healthy.  Can someone 
> on this list shed some light regarding reliability and accuracy of 
> these various speed tests especially for an Edu with lots'o bandwidth?  Thanks.
>
>  
>
> Bill Murphy
>
> University of Texas Health Science Center - Houston
>
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