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: <534E473E.20303@nsn.com>
Date:	Wed, 16 Apr 2014 11:02:54 +0200
From:	Alexander Sverdlin <alexander.sverdlin@....com>
To:	ext Dongsheng Song <dongsheng.song@...il.com>,
	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>
Subject: Re: [PATCH net] Revert "net: sctp: Fix a_rwnd/rwnd management to
 reflect real state of the receiver's buffer"

Hi Dongsheng!

On 16/04/14 10:39, ext Dongsheng Song wrote:
>>>From my testing, netperf throughput from 600 Mbit/s drop to 6 Mbit/s,
> the penalty is 99 %.

The question was, do you see this as a problem of the new rwnd algorithm?
If yes, how exactly? The algorithm actually has no preference to any amount of data.
It was fine-tuned before to serve as congestion control algorithm, but this should
be located elsewhere. Perhaps, indeed, a re-use of congestion control modules from
TCP would be possible...

> 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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> 
> 

-- 
Best regards,
Alexander Sverdlin.
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