[e2e] [Iccrg] Re: Reasons not to deply TCP BIC/Cubic
muraris at microsoft.com
Wed Nov 30 13:31:44 PST 2011
NIST did a very comprehensive study along these lines comparing and documenting different congestion algorithms.
From: iccrg-bounces at cs.ucl.ac.uk [mailto:iccrg-bounces at cs.ucl.ac.uk] On Behalf Of sannikov
Sent: Wednesday, November 30, 2011 6:56 AM
To: Saverio Mascolo
Cc: iccrg; end2end-interest
Subject: Re: [Iccrg] Re: [e2e] Reasons not to deply TCP BIC/Cubic
I'm not so familiar with CUBIC, but it is really aggressive.
And as far as I know Linux implementation is little bit differ from the original.
Did have original version same problems?
With best regards, Alexander Sannikov.
On Wed, 30 Nov 2011 13:08:05 +0100, Saverio Mascolo <saverio.mascolo at gmail.com> wrote:
> On Wed, Nov 30, 2011 at 12:56 PM, Michael Welzl wrote:
> This should really go to ICCRG, I'd say (added to recipients). May I
> 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
> Westwood+; 2. a larger number of retransmission wrt to TCP NewReno or
> Westwood+; 3 larger throughput but same goodput wrt to TCP NewReno or
> In other terms, it seems that its more aggressive probing increases
> throughput and retransmissions but leaving unchanged the goodput. This
> 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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