[185671] in North American Network Operators' Group
Re: Long-haul 100Mbps EPL circuit throughput issue
daemon@ATHENA.MIT.EDU (Pablo Lucena)
Thu Nov 5 21:21:08 2015
X-Original-To: nanog@nanog.org
In-Reply-To: <CAH+2GVLSUYMo-XGdQc1knYEq1hA13=NOQf4jP=2fiNFMQoC5aw@mail.gmail.com>
From: Pablo Lucena <plucena@coopergeneral.com>
Date: Thu, 5 Nov 2015 21:18:38 -0500
To: bob <bob@fiberinternetcenter.com>
Cc: NANOG Operators' Group <nanog@nanog.org>,
Eric Dugas <edugas@unknowndevice.ca>
Errors-To: nanog-bounces@nanog.org
> With default window size of 64KB, and a delay of 75 msec, you should only
> get around 7Mbps of throughput with TCP.
>
> You would need a window size of about 1MB in order to fill up the 100 Mbp=
s
> link.
>
> 1/0.75 =3D 13.333 (how many RTTs in a second)
> 13.333 * 65535 * 8 =3D 6,990,225.24 (about 7Mbps)
>
> You would need to increase the window to 1,048,560 KB, in order to get
> around 100Mbps.
>
> 13.333 * 1,048,560 * 8 =3D 111,843,603.84 (about 100 Mbps)
>
>>
>>
>>
>
=E2=80=8BI realized I made a typo:
1/*0.075* =3D 13.333
not
1/0.75 =3D 13.333
=E2=80=8B
