netdev - Re: [PATCH net] Revert "net: sctp: Fix a_rwnd/rwnd management to reflect real state of the receiver's buffer"

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Message-ID: <CAE8XmWqgcNAHcKnzdUamQ0T+NP27GKSiRv37JEHSQW-=1Fu=2w@mail.gmail.com>
Date:	Wed, 16 Apr 2014 16:39:40 +0800
From:	Dongsheng Song <dongsheng.song@...il.com>
To:	Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@....com>
Cc:	ext Vlad Yasevich <vyasevich@...il.com>,
	Daniel Borkmann <dborkman@...hat.com>, davem@...emloft.net,
	netdev@...r.kernel.org,
	"linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
	Alexander Sverdlin <alexander.sverdlin@....com>
Subject: Re: [PATCH net] Revert "net: sctp: Fix a_rwnd/rwnd management to
 reflect real state of the receiver's buffer"

>From my testing, netperf throughput from 600 Mbit/s drop to 6 Mbit/s,
the penalty is 99 %.

http://www.spinics.net/lists/linux-sctp/msg03308.html


On Wed, Apr 16, 2014 at 2:57 PM, Matija Glavinic Pecotic
<matija.glavinic-pecotic.ext@....com> wrote:
>
> Hello Vlad,
>
> On 04/14/2014 09:57 PM, ext Vlad Yasevich wrote:
> > The base approach is sound.  The idea is to calculate rwnd based
> > on receiver buffer available.  The algorithm chosen however, is
> > gives a much higher preference to small data and penalizes large
> > data transfers.  We need to figure our something else here..
>
> I don't follow you here. Could you please explain what do you see as penalty?
>
> Thanks,
>
> Matija
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