[Iccrg] Re: [e2e] Reasons not to deply TCP BIC/Cubic

[Saverio Mascolo]

yes!

On Wed, Nov 30, 2011 at 12:56 PM, Michael Welzl <michawe at ifi.uio.no> wrote:

> This should really go to ICCRG, I'd say (added to recipients). May I ask
> to continue this (interesting!) discussion there?
>
>
>
> On 11/30/11 12:10 PM, mascolo at poliba.it wrote:
>
>> 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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>>
>>
>
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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

http://c3lab.poliba.it


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