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: <534CDAF5.1040900@redhat.com>
Date:	Tue, 15 Apr 2014 09:08:37 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Alexander Sverdlin <alexander.sverdlin@....com>
CC:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-sctp@...r.kernel.org,
	Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@....com>,
	Vlad Yasevich <vyasevich@...il.com>, pbutler@...usnet.com
Subject: Re: [PATCH net] Revert "net: sctp: Fix a_rwnd/rwnd management to
 reflect real state of the receiver's buffer"

Hi Matija,

[cc'ing Peter]

On 04/15/2014 08:43 AM, Alexander Sverdlin wrote:
> 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?

If you would like to get to know the exact specifics from the bug report,
resp. numbers from the commit message, I refer you to Peter's setup, i.e.
he used ixgbe NICs as these are one of the few with SCTP checksum
offloading available.

Thanks,

Daniel

  [1] http://www.spinics.net/lists/linux-sctp/msg03290.html
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