netdev - Re: Serious performance degradation in Linux 4.15

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Message-ID: <20180216101701.GA25201@hirez.programming.kicks-ass.net>
Date:   Fri, 16 Feb 2018 11:17:01 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Matt Fleming <matt@...eblueprint.co.uk>
Cc:     Jon Maloy <jon.maloy@...csson.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "David Miller (davem@...emloft.net)" <davem@...emloft.net>,
        Mike Galbraith <umgwanakikbuti@...il.com>,
        Mel Gorman <mgorman@...e.de>
Subject: Re: Serious performance degradation in Linux 4.15

On Wed, Feb 14, 2018 at 10:46:20PM +0000, Matt Fleming wrote:
>  3. ./run-mmtests.sh --config=configs/config-global-dhp__network-netperf-unbound `uname -r`

Not a success.. firstly it attempts to install packages without asking
and then horribly fails at it..

root@...-ep:/usr/local/src/mmtests# ./run-mmtests.sh --config=configs/config-global-dhp__network-netperf-unbound `uname -r`
Reading package lists... Done
Building dependency tree
Reading state information... Done
Use 'apt autoremove' to remove them.
The following NEW packages will be installed:
  binutils-dev
0 upgraded, 1 newly installed, 0 to remove and 1 not upgraded.
Need to get 2,339 kB of archives.
After this operation, 21.1 MB of additional disk space will be used.
Get:1 http://ftp.nl.debian.org/debian testing/main amd64 binutils-dev amd64 2.30-4 [2,339 kB]
Fetched 2,339 kB in 1s (3,451 kB/s)
Selecting previously unselected package binutils-dev.
(Reading database ... 126177 files and directories currently installed.)
Preparing to unpack .../binutils-dev_2.30-4_amd64.deb ...
Unpacking binutils-dev (2.30-4) ...
Setting up binutils-dev (2.30-4) ...
W: --force-yes is deprecated, use one of the options starting with --allow instead.
Installed binutils-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
W: --force-yes is deprecated, use one of the options starting with --allow instead.
E: Unable to locate package oprofile
Failed to install package oprofile for distro debian at /usr/local/src/mmtests/bin/install-depends line 121.
Reading package lists... Done
Building dependency tree
Reading state information... Done
W: --force-yes is deprecated, use one of the options starting with --allow instead.
E: Unable to locate package perl-Time-HiRes
Failed to install package perl-Time-HiRes for distro debian at /usr/local/src/mmtests/bin/install-depends line 121.
Reading package lists... Done
Building dependency tree
Reading state information... Done
W: --force-yes is deprecated, use one of the options starting with --allow instead.
E: Unable to locate package hwloc-lstopo
Failed to install package hwloc-lstopo for distro debian at /usr/local/src/mmtests/bin/install-depends line 121.
Reading package lists... Done
Building dependency tree
Reading state information... Done
W: --force-yes is deprecated, use one of the options starting with --allow instead.
E: Unable to locate package cpupower
Failed to install package cpupower for distro debian at /usr/local/src/mmtests/bin/install-depends line 121.
Using default SHELLPACK_DATA
grep: /usr/local/src/mmtests/shellpacks/shellpack-bench-netperf-udp: No such file or directory
Starting test netperf-udp
/usr/local/src/mmtests/bin/unbuffer: 8: exec: tclsh: not found
ls: cannot access '/proc/16070/fd/0': No such file or directory
ls: cannot access '/proc/16070/fd/0': No such file or directory

after which I killed it dead...

This is one dodgy script which I'll not touch again. Please provide a
small bash script that wraps the right netperf magic and I'll try and
run that.