From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Borkmann Date: Tue, 15 Apr 2014 07:08:37 +0000 Subject: Re: [PATCH net] Revert "net: sctp: Fix a_rwnd/rwnd management to reflect real state of the receiver' Message-Id: <534CDAF5.1040900@redhat.com> List-Id: References: <1397504717-19566-1-git-send-email-dborkman@redhat.com> <534CD523.50301@nsn.com> In-Reply-To: <534CD523.50301@nsn.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Alexander Sverdlin Cc: davem@davemloft.net, netdev@vger.kernel.org, linux-sctp@vger.kernel.org, Matija Glavinic Pecotic , Vlad Yasevich , pbutler@sonusnet.com 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