On Thu, 04 Jun 2015 16:44:53 -0700
Gary Roach <garyroach@verizon.net> wrote:
> On 06/03/2015 11:55 PM, Petter Adsen wrote:
> > Well, it's not shut down, as I just tried it and it works fine here.
> > Maybe it was down, though, and you should try again?
> >
> > If it still doesn't work, then check your firewall. It shouldn't give
> > you any problems, as you are simply trying to establish a connection to
> > port 5201 on a remote machine, but check. Enable firewall logging, if
> > possible, and see if anything gets blocked. Verify that you can reach
> > the webserver running on the same host.
> >
> > Also try with UDP ("-u -b 0").
> >
> > Petter
> >
> Well all of a sudden iperf.scottlinux.com works The send and receive
> with TCP packets is about the same. Below is a typical example:
>
> root@xxxxxxxxxx# iperf3 -c iperf.scottlinux.com -R -V
<snip>
> Test Complete. Summary Results:
> [ ID] Interval Transfer Bandwidth Retr
> [ 4] 0.00-10.00 sec 32.4 MBytes 27.2 Mbits/sec 0 sender
> [ 4] 0.00-10.00 sec 32.2 MBytes 27.0 Mbits/sec
> receiver
> CPU Utilization: local/receiver 3.8% (0.6%u/3.2%s), remote/sender 0.1%
> (0.0%u/0.1%s)
>
> iperf Done.
>
> As you can see, I'm getting about half of the 50Mbits/sec for which I
> contracted. But this is way better than my actual speed. I ran the same
> test with udp packets and got:
When I tested against the same host last night I got around 40Mbps (I
also have 50Mbps), but I'm in Norway, so that doesn't seem so bad. I
tried again right now, and got ~45Mbps.
What do you mean that this is way better than your actual speed? This
_is_ the measured speed to this host :) Do you normally get lower speed
to other hosts?
Your ISP probably doesn't guarantee that you actually get 50Mbps
unless you have a business line, but most likely says "speeds _up to_
50Mbps" or something similar. So that would be normal.
Also try a few online speed tests, like the one at speed.io, and see
what they tell you. Your ISP might also have one.
> root@xxxxxxx# iperf3 -c iperf.scottlinux.com -R -u -V
<snip>
> - - - - - - - - - - - - - - - - - - - - - - - - -
> Test Complete. Summary Results:
> [ ID] Interval Transfer Bandwidth Jitter Lost/Total
> Datagrams
> [ 4] 0.00-10.00 sec 1.26 MBytes 1.06 Mbits/sec 0.660 ms 0/161 (0%)
> [ 4] Sent 161 datagrams
> CPU Utilization: local/receiver 0.3% (0.0%u/0.3%s), remote/sender 0.1%
> (0.0%u/0.1%s)
>
> iperf Done.
>
> Now I'm really confused. I thought UDP packets were going through at
> full speed and TCP plackets were slow. This data says just the opposite.
Yeah, Reco just explained this to me in a different thread. For UDP you
need to specify the target bandwidth, the default is 1Mbps. Use "-b 0"
to set it to unlimited. For earlier versions it needs to be at the end
of the line, don't know about iperf3. See the man page for details.
Petter
--
"I'm ionized"
"Are you sure?"
"I'm positive."
Attachment:
pgpXY1Ic1b134.pgp
Description: OpenPGP digital signature