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References: <tohojo/flent/issues/203@github.com>
	<tohojo/flent/issues/203/608963421@github.com>
In-Reply-To: <tohojo/flent/issues/203/608963421@github.com>
From: Dave Taht <dave.taht@gmail.com>
Date: Fri, 3 Apr 2020 20:25:34 -0700
Message-ID: <CAA93jw4aePsYyDCBnbyYf4F0CK6O_s9g86Q31fOtx12nHixK7w@mail.gmail.com>
To: "tohojo/flent"
	<reply+AHVNJP3FJVPSTXEWYLUEJQN4SPN6VEVBNHHCF7XB3M@reply.github.com>
Subject: Re: [Flent-users] [tohojo/flent] Customized test displaying error
 (#203)
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sudo python3 setup.py install
or
make install

flent is actually measuring rate differences, it does not actually assign
bandwidth. So your result - where the first flow grabs more bandwidth than
the others, is an artifact of your queuing (probably fifo and tcp cubic).
The first flow wins. In the case where you have a delay based tcp, the last
flow usually wins. In the case of a good AQM, all flows converge to a good,
roughly equal rate in rapid order.

Summary statistics are not a very useful way of looking at tcp behaviors
over time.

for more details on what's going on in the tcp stack, on linux, the tcp_nup
test can be revealing. This will capture internal tcp stats on this test.

flent -H wherever -t whatever --te=3Dupload_streams=3D4 --socket-stats
--step-size .04 tcp_nup

On Fri, Apr 3, 2020 at 8:12 PM olg33 <notifications@github.com> wrote:

> Thanks Tohojo,
>
> I just cloned the repository and ran Flent using the run-Flent script.
> It's awesome! I tested several scenarios and in all cases it worked as
> expected. I just Have a question, how is the bandwidth assigned to each
> marked data stream? for instance, in one test I got the following bandwid=
th
> for these TCP streams:
>
> TCP download::0 (11) : 85.08 86.78 Mbits/s
> TCP download::1 (15) : 52.73 53.28 Mbits/s
> TCP download::1 (10) : 57.78 58.45 Mbits/s
>
> Are these values 86.78Mb/s, 53.28Mb/s and 58.45 Mb/s assigned ramdomly?
> What's the criteria to distribute the bandwitdth this way? or, can it be
> assigned via parameter, like a percentage of the total bandwidth availabl=
e?
>
> Finally, I'd like to properly install the cloned version of Flent via
> "make install". Normally there is an autogen.sh and/or a configure script
> we run before proceeding with the compilation and file creation -make
> install- but I can't find these files in the cloned file system. Could yo=
u
> tell me where to find these files or if they have a different name?
>
> Thank you so much for all your kind help.
>
> =E2=80=94
> You are receiving this because you commented.
> Reply to this email directly, view it on GitHub
> <https://github.com/tohojo/flent/issues/203#issuecomment-608963421>, or
> unsubscribe
> <https://github.com/notifications/unsubscribe-auth/AHVNJP4R7BPSPRGEQ7PNB2=
3RK2QOVANCNFSM4LS2ZHEQ>
> .
> _______________________________________________
> Flent-users mailing list
> Flent-users@flent.org
> http://flent.org/mailman/listinfo/flent-users_flent.org
>


--=20
Make Music, Not War

Dave T=C3=A4ht
CTO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-831-435-0729

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<div dir=3D"ltr"><div>sudo python3 setup.py install</div><div>or <br></div>=
<div>make install</div><div><br></div><div>flent is actually measuring rate=
 differences, it does not actually assign bandwidth. So your result - where=
 the first flow grabs more bandwidth than the others, is an artifact of you=
r queuing (probably fifo and tcp cubic). The first flow wins. In the case w=
here you have a delay based tcp, the last flow usually wins. In the case of=
 a good AQM, all flows converge to a good, roughly equal rate in rapid orde=
r. <br></div><div><br></div><div>Summary statistics are not a very useful w=
ay of looking at tcp behaviors over time.<br></div><div><br></div><div>for =
more details on what&#39;s going on in the tcp stack, on linux, the tcp_nup=
 test can be revealing. This will capture internal tcp stats on this test.<=
br></div><div><br></div><div>flent -H wherever -t whatever --te=3Dupload_st=
reams=3D4 --socket-stats --step-size .04 tcp_nup<br></div></div><br><div cl=
ass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3, 20=
20 at 8:12 PM olg33 &lt;<a href=3D"mailto:notifications@github.com">notific=
ations@github.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);p=
adding-left:1ex"><p></p>
<p>Thanks Tohojo,</p>
<p>I just cloned the repository and ran Flent using the run-Flent script. I=
t&#39;s awesome! I tested several scenarios and in all cases it worked as e=
xpected. I just Have a question, how is the bandwidth assigned to each mark=
ed data stream? for instance, in one test I got the following bandwidth for=
 these TCP streams:</p>
<blockquote>
<p>TCP download::0 (11)  :   85.08       86.78 Mbits/s<br>
TCP download::1 (15) :    52.73       53.28 Mbits/s<br>
TCP download::1 (10) :    57.78       58.45 Mbits/s</p>
</blockquote>
<p>Are these values 86.78Mb/s, 53.28Mb/s and 58.45 Mb/s assigned ramdomly? =
What&#39;s the criteria to distribute the bandwitdth this way? or, can it b=
e assigned via parameter, like a percentage of the total bandwidth availabl=
e?</p>
<p>Finally, I&#39;d like to properly install the cloned version of Flent vi=
a &quot;make install&quot;.  Normally there is an autogen.sh and/or a confi=
gure script we run before proceeding with the compilation and file creation=
 -make install- but I can&#39;t find these files in the cloned file system.=
 Could you tell me where to find these files or if they have a different na=
me?</p>
<p>Thank you so much for all your kind help.</p>

<p style=3D"font-size:small;color:rgb(102,102,102)">=E2=80=94<br>You are re=
ceiving this because you commented.<br>Reply to this email directly, <a hre=
f=3D"https://github.com/tohojo/flent/issues/203#issuecomment-608963421" tar=
get=3D"_blank">view it on GitHub</a>, or <a href=3D"https://github.com/noti=
fications/unsubscribe-auth/AHVNJP4R7BPSPRGEQ7PNB23RK2QOVANCNFSM4LS2ZHEQ" ta=
rget=3D"_blank">unsubscribe</a>.<img src=3D"https://github.com/notification=
s/beacon/AHVNJP3KS527C7CRVFN2EQLRK2QOVA5CNFSM4LS2ZHE2YY3PNVWWK3TUL52HS4DFVR=
EXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOERGAWXI.gif" alt=3D"" width=3D"1" hei=
ght=3D"1"></p>
_______________________________________________<br>
Flent-users mailing list<br>
<a href=3D"mailto:Flent-users@flent.org" target=3D"_blank">Flent-users@flen=
t.org</a><br>
<a href=3D"http://flent.org/mailman/listinfo/flent-users_flent.org" rel=3D"=
noreferrer" target=3D"_blank">http://flent.org/mailman/listinfo/flent-users=
_flent.org</a><br>
</blockquote></div><br clear=3D"all"><br>-- <br><div dir=3D"ltr" class=3D"g=
mail_signature">Make Music, Not War<br><br>Dave T=C3=A4ht<br>CTO, TekLibre,=
 LLC<br><a href=3D"http://www.teklibre.com" target=3D"_blank">http://www.te=
klibre.com</a><br>Tel: 1-831-435-0729</div>

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