> Date: Mon, 2 Nov 2009 18:22:19 -0500
> From: Jon Meek
>
> I use iperf with packet capture on both sides, then analyze the packet
> capture for per-second throughput and re-transmits. I usually do 10
> TCP streams for 30 seconds.
>
> Note that on GigE with significant RTTs (5-15 ms) some TCP tu
We had a problem where our (mostly research network connected, international)
users were getting generally low HTTP transfer speeds, even though the path was
often gigabit. The classic high bandwidth/high latency problem.
Initially I tried using iperf/ndt and friends but found that iperf require
Linux always worked best for us as well, was easy running a livecd with
laptops. We found that two windows XP machines, same identical hardware and
OS load yielded different registry settings (or lack thereof) for TCP Window
setting.
Jason
On Tue, Nov 3, 2009 at 6:18 AM, Bret Clark wrote:
>
On Tue, 3 Nov 2009, Jason Biel wrote:
Please take note with using iperf that you'll want to make sure the
appropriate TCP Window Size has been negotiated. We recently did some
testing with systems that had decided to pick less than optimal window sizes
and in turn had to manually set the size w
True, we usually find Linux based machines work better running IPerf
then Windows (at least out of the box) because of the TCP window
sizewell Windows XP at least, don't know about Vista or 7.
Jason Biel wrote:
Please take note with using iperf that you'll want to make sure the
app
Please take note with using iperf that you'll want to make sure the
appropriate TCP Window Size has been negotiated. We recently did some
testing with systems that had decided to pick less than optimal window sizes
and in turn had to manually set the size within iperf options.
Jason
On Tue, Nov
Hello,
Iperf is pretty good at this ... It s free
Ben
-Message d'origine-
De : Mark Urbach [mailto:mark.urb...@pnpt.com]
Envoyé : lundi 2 novembre 2009 22:57
À : nanog@nanog.org
Objet : Speed Testing and Throughput testing
Anyone have a good solution to get "accurate" speed results w
On Mon, Nov 2, 2009 at 4:56 PM, Mark Urbach wrote:
> Anyone have a good solution to get "accurate" speed results when testing at
> 10/100/1000 Ethernet speeds?
>
> Do you have a server/software that customer can test too?
One wonders how netnod does this... I believe they put in some servers
spe
On Mon, Nov 02, 2009 at 01:30:18PM -1000, Michael Painter wrote:
> Nathan Ward wrote:
> >On 3/11/2009, at 10:56 AM, Mark Urbach wrote:
> >
> >>Anyone have a good solution to get "accurate" speed results when
> >>testing at 10/100/1000 Ethernet speeds?
>
> An NDT server?... such as:
> http://ndt.an
Nathan Ward wrote:
On 3/11/2009, at 10:56 AM, Mark Urbach wrote:
Anyone have a good solution to get "accurate" speed results when
testing at 10/100/1000 Ethernet speeds?
An NDT server?... such as:
http://ndt.anl.gov:7123/
Hello,
On Mon, Nov 02, 2009 at 03:56:56PM -0600, Mark Urbach wrote:
> Anyone have a good solution to get "accurate" speed results when
> testing at 10/100/1000 Ethernet speeds?
iperf. Check
http://www.nanog.org/meetings/nanog43/abstracts.php?pt=MjkmbmFub2c0Mw==&nm=nanog43
and
http:/
I use iperf with packet capture on both sides, then analyze the packet
capture for per-second throughput and re-transmits. I usually do 10
TCP streams for 30 seconds.
Note that on GigE with significant RTTs (5-15 ms) some TCP tuning is
needed to deal with the bandwidth delay product. It is also po
perfsonar livecd offers npad service that remote hosts can connect and
see the performance and results.
http://www.internet2.edu/performance/toolkit/index.html
TcpOptimizer helps tunning the tcp/ip for windows systems.
http://www.speedguide.net/downloads.php
nuttcp is good to generate packets/s
On 3/11/2009, at 10:56 AM, Mark Urbach wrote:
Anyone have a good solution to get "accurate" speed results when
testing at 10/100/1000 Ethernet speeds?
If you want accuracy, you want to buy a packet generator/router tester
unit.
I just built a tool for a customer (a last-mile network provi
iperf is fairly standard and supports some handy features -
http://en.wikipedia.org/wiki/Iperf
-Jack Carrozzo
On Mon, Nov 2, 2009 at 4:56 PM, Mark Urbach wrote:
> Anyone have a good solution to get "accurate" speed results when testing at
> 10/100/1000 Ethernet speeds?
>
> Do you have a server/
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