On Tuesday 12 November 2002 17:58, Dan Farino wrote:
> Hi Stef,
>
> Thanks for the reply! However, I think the gap is way too large to be
> explained by overhead, etc.
>
> Here are the results from some other tests. I started with:
> tc qdisc add dev eth2 root tbf rate 1.9mbit buffer 20Kb/8 limit 15Kb
>
> Here are the average transfer rates measured over approx 20 seconds
> (again according to PerfMon) as I change the "1.9mbit" to other values
> while performing a large download:
>
> Mbit Kb/s
> ----- ------
> 2.5 360
> 2.0 360
> 1.9 360
> 1.8 240
> 1.5 240
> 1.4 240
> 1.3 180
> 1.2 180
>
> The lines really are that flat. There is nothing resembling the graphs
> on your site. Mine has the low-res, stair-step effect that you can see
> by graphing the above numbers.
>
> I can't seem to find any "mbit" number that will actually produce a cap
> at exactly 2mbit.
>
> I will try a both different type NIC and Debian at some point today.
What NIC are you using ?
> Thanks for your help!
No problem. I can send you my scripts that I use the record the bandwidth
usage. Some of them can be found on www.docum.org. Basically, I create a
iptables chain for each traffic stream I want to monitor. I record the
counters each second and calculates the bandwdith.
I have some scripts that executes a htb script, starts the needed flows,
calculates the bandwidth, if the bandwidth is stable : record the bandwidth,
restart the proces with a different setting.
After some time, you have it for each rate so you can create a nice graph.
Stef
--
stef.coene@docum.org
"Using Linux as bandwidth manager"
http://www.docum.org/
#lartc @ irc.oftc.net
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