linux-kernel - Re: [LKP] [lkp] [sctp] a6c2f79287: netperf.Throughput

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Date:	Tue, 16 Aug 2016 16:30:43 +0800
From:	Aaron Lu <aaron.lu@...el.com>
To:	Xin Long <lucien.xin@...il.com>
Cc:	kernel test robot <xiaolong.ye@...el.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org,
	"David S. Miller" <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [LKP] [lkp] [sctp] a6c2f79287: netperf.Throughput_Mbps -37.2%
 regression

On 08/16/2016 04:02 PM, Xin Long wrote:
>>
>> I'm testing on Linus' master, can we all use that please?
>>
> 
> [git] git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> 
> [mechine]
> Intel(R) Xeon(R) CPU E5-2690 v2 @ 3.00GHz
> mem 62G (66000220K)
> 
> [system]
> # cat /etc/redhat-release
> Red Hat Enterprise Linux Server release 7.3 Beta (Maipo)
> 
> [commit 3684b03]
> [root@...dl380pg8-11 lxin]# uname -r
> 4.8.0-rc2.3684b03
> [root@...dl380pg8-11 lxin]# cat test.sh
> killall -0 netserver || netserver -4 &
> netperf -4 -t SCTP_STREAM_MANY -c -C -l 300 -- -m 10K -H 127.0.0.1
> [root@...dl380pg8-11 lxin]# sh test.sh
> SCTP 1-TO-MANY STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
> 127.0.0.1 () port 0 AF_INET
> Recv   Send    Send                          Utilization       Service Demand
> Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
> Size   Size    Size     Time     Throughput  local    remote   local   remote
> bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB   us/KB
> 
> 212992 212992  10240    300.00     16914.99   3.28     3.28     0.636   0.636
> 
> [commit f959fb4]
> [root@...alhost lxin]# uname -r
> 4.7.0-rc6.f959fb4
> [root@...alhost lxin]# cat test.sh
> killall -0 netserver || netserver -4 &
> netperf -4 -t SCTP_STREAM_MANY -c -C -l 300 -- -m 10K -H 127.0.0.1
> [root@...alhost lxin]# sh test.sh
> SCTP 1-TO-MANY STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
> 127.0.0.1 () port 0 AF_INET
> Recv   Send    Send                          Utilization       Service Demand
> Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
> Size   Size    Size     Time     Throughput  local    remote   local   remote
> bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB   us/KB
> 
> 212992 212992  10240    300.00     12975.32   3.35     3.35     0.847   0.846
> 
> 
> Still, in my env, the latest kernel is better than old one.
> Sorry, I'm not sure why it's so different in your env.

Could the test have anything to do with the hardware? i.e. yours is Xeon
E5-2690 while mine is IVB i3?

> 
> Could you do 'netperf' test manually, instead of lkp-tests, then check again.

Manually test under LKP is not easy as those test machines are all doing
things automatically. But if you think that is necessary, I can do that.

> Pls show you system's distros as well, like rhel, ubuntu or arch ?

We do not use any of these distros.
The rootfs is derived from debian:
https://github.com/fengguang/reproduce-kernel-bug/blob/master/debian/debian-x86_64-2015-02-07.cgz

Thanks,
Aaron