lkml.org 
[lkml]   [2016]   [Aug]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [LKP] [lkp] [sctp] a6c2f79287: netperf.Throughput_Mbps -37.2% regression
From
Date
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@hp-dl380pg8-11 lxin]# uname -r
> 4.8.0-rc2.3684b03
> [root@hp-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

\
 
 \ /
  Last update: 2016-09-17 09:57    [W:0.089 / U:1.096 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site