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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Date:	Tue, 15 Apr 2014 14:27:26 +0000
From:	"Butler, Peter" <pbutler@...usnet.com>
To:	Alexander Sverdlin <alexander.sverdlin@....com>,
	ext Daniel Borkmann <dborkman@...hat.com>,
	"davem@...emloft.net" <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
	"Matija Glavinic Pecotic" <matija.glavinic-pecotic.ext@....com>,
	Vlad Yasevich <vyasevich@...il.com>
Subject: RE: [PATCH net] Revert "net: sctp: Fix a_rwnd/rwnd management to
 reflect real state of the receiver's buffer"

I'm not sure if the following processing power is actually required to reproduce the problem, but this is my setup:

- 2 single-board computers (SBCs), each a Xeon C5528 @ 2.13GHz (4-core with HT = 8 cores each)
- 10Gb Intel 82599EB NICs (IXGBE); each SBC has 2 of these but only 1 was used for this SCTP testing (i.e. NOT multi-homed)
- 10Gb backplane, approx. 0.2 ms RTT (however I also tested this with RTT = 10 ms, 20 ms, 50 ms and it is reproducible in all scenarios)
- send buffer size = 1200000, receive buffer size = 3000000




-----Original Message-----
From: linux-sctp-owner@...r.kernel.org [mailto:linux-sctp-owner@...r.kernel.org] On Behalf Of Alexander Sverdlin
Sent: April-15-14 2:44 AM
To: ext Daniel Borkmann; davem@...emloft.net
Cc: netdev@...r.kernel.org; linux-sctp@...r.kernel.org; Matija Glavinic Pecotic; Vlad Yasevich
Subject: Re: [PATCH net] Revert "net: sctp: Fix a_rwnd/rwnd management to reflect real state of the receiver's buffer"

Hello Daniel,

On 14/04/14 21:45, ext Daniel Borkmann wrote:
> This reverts commit ef2820a735f7 ("net: sctp: Fix a_rwnd/rwnd 
> management to reflect real state of the receiver's buffer") as it 
> introduced a serious performance regression on SCTP over IPv4 and 
> IPv6, though a not as dramatic on the latter. Measurements are on 10Gbit/s with ixgbe NICs.

Could you please share other HW details? I wonder how much CPU power one needs for such a throughput?

--
Best regards,
Alexander Sverdlin.
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