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: <20140414.164839.2032159104530481155.davem@davemloft.net>
Date:	Mon, 14 Apr 2014 16:48:39 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	dborkman@...hat.com
Cc:	netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
	matija.glavinic-pecotic.ext@....com, alexander.sverdlin@....com,
	vyasevich@...il.com
Subject: Re: [PATCH net] Revert "net: sctp: Fix a_rwnd/rwnd management to
 reflect real state of the receiver's buffer"

From: Daniel Borkmann <dborkman@...hat.com>
Date: Mon, 14 Apr 2014 21:45:17 +0200

> 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.
> 
> Current state:
 ...
> With the reverted patch applied, the SCTP/IPv4 performance is back
> to normal on latest upstream for IPv4 and IPv6 and has same throughput
> as 3.4.2 test kernel, steady and interval reports are smooth again.
> 
> Fixes: ef2820a735f7 ("net: sctp: Fix a_rwnd/rwnd management to reflect real state of the receiver's buffer")
> Reported-by: Peter Butler <pbutler@...usnet.com>
> Reported-by: Dongsheng Song <dongsheng.song@...il.com>
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Tested-by: Peter Butler <pbutler@...usnet.com>
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>

Applied and queued up for -stable.
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