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

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Date:	Tue, 16 Aug 2016 16:51:43 +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

I just realized the test we are doing is not exactly the same.
As the original report says:
        ip: ipv4
        runtime: 300s
        nr_threads: 200%
        cluster: cs-localhost
        send_size: 10K
        test: SCTP_STREAM_MANY
        cpufreq_governor: performance

Note the nr_threads: 200%, which means to start 2 times of CPU number
processes of netperf.

In our IVB i3(2 cores, 2 threads per core) case, 8 netperf processes
are started concurrently:

2016-07-27 03:48:09 netperf -4 -t SCTP_STREAM_MANY -c -C -l 300 -- -m 10K -H 127.0.0.1 &
2016-07-27 03:48:09 netperf -4 -t SCTP_STREAM_MANY -c -C -l 300 -- -m 10K -H 127.0.0.1 &
2016-07-27 03:48:09 netperf -4 -t SCTP_STREAM_MANY -c -C -l 300 -- -m 10K -H 127.0.0.1 &
2016-07-27 03:48:09 netperf -4 -t SCTP_STREAM_MANY -c -C -l 300 -- -m 10K -H 127.0.0.1 &
2016-07-27 03:48:09 netperf -4 -t SCTP_STREAM_MANY -c -C -l 300 -- -m 10K -H 127.0.0.1 &
2016-07-27 03:48:09 netperf -4 -t SCTP_STREAM_MANY -c -C -l 300 -- -m 10K -H 127.0.0.1 &
2016-07-27 03:48:09 netperf -4 -t SCTP_STREAM_MANY -c -C -l 300 -- -m 10K -H 127.0.0.1 &
2016-07-27 03:48:09 netperf -4 -t SCTP_STREAM_MANY -c -C -l 300 -- -m 10K -H 127.0.0.1 &

The throughput is the average of those runs.

And I think we should be doing test on:
commit a6c2f79287 ("sctp: implement prsctp TTL policy") (the bisected one)
and
commit 826d253d57 ("sctp: add SCTP_PR_ASSOC_STATUS on sctp sockopt") (its immediate parent)
instead of Linus' master HEAD to avoid other factors.

Thanks,
Aaron