[e2e] Reasons not to deply TCP BIC/Cubic

Saverio Mascolo mascolo at poliba.it
Wed Nov 30 04:31:22 PST 2011

i think windows uses tcp compund (that we have not investigated...)

On Wed, Nov 30, 2011 at 1:23 PM, Barry Constantine <
Barry.Constantine at jdsu.com> wrote:

> Hi Saverio,
> Does Windows 7 use this TCP implementation as well?
> Thank you,
> Barry Constantine
> -----Original Message-----
> From: end2end-interest-bounces at postel.org [mailto:
> end2end-interest-bounces at postel.org] On Behalf Of mascolo at poliba.it
> Sent: Wednesday, November 30, 2011 6:11 AM
> To: end2end-interest at postel.org
> Subject: [e2e] Reasons not to deply TCP BIC/Cubic
> Dear all,
> we know that TCP BIC/Cubic is default in Linux and as a consequence
> 50% of servers employs TCP BIC/Cubic.
> Our measurements say that there could be reasons not to deploy TCP
> BIC/Cubic. These reasons  are in our opinion rooted in its more
> aggressive probing phase. In particular, in common network conditions,
> TCP BIC/CUBIC exhibits: 1. a larger RTT average wrt to TCP NewReno or
> TCP Westwood+; 2. a larger number of retransmission wrt to TCP NewReno
> or TCP Westwood+; 3 larger throughput but same goodput wrt to TCP
> NewReno or Westwood+.
> In other terms, it seems that its more aggressive probing increases
> both throughput and retransmissions but leaving unchanged the goodput.
> This is  neutral for the users but negative for the network.
> I appreciate your views.
> Thanks for the attention and best regards,
> Saverio Mascolo
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Prof. Saverio Mascolo
Dipartimento di Elettrotecnica ed Elettronica
Politecnico di Bari
Via Orabona 4, 70125 Bari Italy
Tel. +39 080 5963621
Fax. +39 080 5963410
email:mascolo at poliba.it


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