From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1755817AbcHSHVC (ORCPT <rfc822;w@1wt.eu>);
        Fri, 19 Aug 2016 03:21:02 -0400
Received: from mail-qk0-f172.google.com ([209.85.220.172]:33234 "EHLO
        mail-qk0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1755667AbcHSHU7 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Fri, 19 Aug 2016 03:20:59 -0400
Subject: Re: [LKP] [lkp] [sctp] a6c2f79287: netperf.Throughput_Mbps -37.2%
 regression
To: Aaron Lu <aaron.lu@intel.com>, Xin Long <lucien.xin@gmail.com>
References: <20160817063719.GA5463@aaronlu.sh.intel.com>
 <CADvbK_dKLU07+tW4f2XpCWgQME8mnjg8EObcfmH4i8s8Aume4w@mail.gmail.com>
 <375f06dd-8439-bba3-8b45-781e1e48dc9c@intel.com>
 <CADvbK_eErG-XPsDZJxjspqfC6dnF7AGSZaWNNzkZajw9SucMAA@mail.gmail.com>
 <20160817084832.GA5342@aaronlu.sh.intel.com>
 <CADvbK_dqSTArYJQGD9--vi4vyV-kfAg50=cK4oc7AhGzSwbLXQ@mail.gmail.com>
 <80bbef60-34ed-0bf1-f1c5-8285b713c2f7@intel.com>
 <CADvbK_fGg=QUxaKAZYei+4DLYW4QDzVaGWTC5GEP2+t42AjmSQ@mail.gmail.com>
 <20160818032156.GA5250@aaronlu.sh.intel.com>
 <CADvbK_cF3Mphd5CDqGVHcbbZ-L8Xz=vRPzdKTzE4A_p-ZBiDVA@mail.gmail.com>
 <20160819052941.GA1179@aaronlu.sh.intel.com>
Cc: kernel test robot <xiaolong.ye@intel.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>, lkp@01.org,
        "David S. Miller" <davem@davemloft.net>,
        LKML <linux-kernel@vger.kernel.org>,
        "Chen, Tim C" <tim.c.chen@intel.com>,
        Huang Ying <ying.huang@intel.com>
From: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Message-ID: <ad074d65-52bd-7b6f-f0c3-b94abf288c9a@gmail.com>
Date: Fri, 19 Aug 2016 04:19:39 -0300
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101
 Thunderbird/45.2.0
MIME-Version: 1.0
In-Reply-To: <20160819052941.GA1179@aaronlu.sh.intel.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Hi,

Em 19-08-2016 02:29, Aaron Lu escreveu:
...
> It doesn't look insane and sctp_wait_for_sndbuf may actually have
> something to do with a larger sctp_chunk I suppose?
>
> The same perf record doesn't capture any sample for the good commit,
> which suggests the nerperf process doesn't sleep in sctp_wait_for_sndbuf.

Ahhh yes! It does, and then it would mean your txbuf is too small for 
the chunk sizes you're using (sctp tests option -m).

What's your netperf cmdline again please?

Regards,
Marcelo