Add cpu-pinning element

The new "cpu-pinning" element optimizes the amphora image for better
vertical scaling. When an amphora flavor with multiple vCPUs is
configured it will configure the kernel to isolate (isolcpus)
all vCPUs except the first one.
Furthermore, it uninstalls irqbalance and sets the IRQ affinity to the
first CPU. That way the other CPUs are free to be used by HAProxy
exclusively. A new customized TuneD profile applies some more tweaks
for improving network latency.

This new feature is disabled by default in diskimage-create.sh.

Story: 2010236
Task: 46042
Change-Id: I1a0591de79be867483a044705e866b2368b2a567
This commit is contained in:
Tom Weininger 2022-07-08 17:57:59 +02:00
parent 344d6d76ce
commit c1ebe18e2a
13 changed files with 190 additions and 1 deletions

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@ -110,6 +110,7 @@ Command syntax:
[-i **ubuntu-minimal** | fedora | centos-minimal | rhel ]
[-k <kernel package name> ]
[-l <log file> ]
[-m]
[-n]
[-o **amphora-x64-haproxy** | <filename> ]
[-p]
@ -132,6 +133,7 @@ Command syntax:
'-i' is the base OS (default: ubuntu-minimal)
'-k' is the kernel meta package name, currently only for ubuntu-minimal base OS (default: linux-image-virtual)
'-l' is output logfile (default: none)
'-m' enable vCPU pinning optimizations (default: disabled)
'-n' disable sshd (default: enabled)
'-o' is the output image file name
'-p' install amphora-agent from distribution packages (default: disabled)"

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@ -31,6 +31,7 @@ usage() {
echo " [-i **ubuntu-minimal** | fedora | centos-minimal | rhel ]"
echo " [-k <kernel package name> ]"
echo " [-l <log file> ]"
echo " [-m]"
echo " [-n]"
echo " [-o **amphora-x64-haproxy.qcow2** | <filename> ]"
echo " [-p]"
@ -52,6 +53,7 @@ usage() {
echo " '-i' is the base OS (default: ubuntu-minimal)"
echo " '-k' is the kernel meta package name, currently only for ubuntu-minimal base OS (default: linux-image-virtual)"
echo " '-l' is output logfile (default: none)"
echo " '-m' enable vCPU pinning optimizations (default: disabled)"
echo " '-n' disable sshd (default: enabled)"
echo " '-o' is the output image file name"
echo " '-p' install amphora-agent from distribution packages (default: disabled)"
@ -92,7 +94,7 @@ dib_enable_tracing=
AMP_LOGFILE=""
while getopts "a:b:c:d:efg:hi:k:l:no:pt:r:s:vw:xy" opt; do
while getopts "a:b:c:d:efg:hi:k:l:mno:pt:r:s:vw:xy" opt; do
case $opt in
a)
AMP_ARCH=$OPTARG
@ -166,6 +168,9 @@ while getopts "a:b:c:d:efg:hi:k:l:no:pt:r:s:vw:xy" opt; do
l)
AMP_LOGFILE="--logfile=$OPTARG"
;;
m)
AMP_ENABLE_CPUPINNING=1
;;
n)
AMP_DISABLE_SSHD=1
;;
@ -253,6 +258,8 @@ if [ "$AMP_BASEOS" = "ubuntu-minimal" ]; then
export DIB_UBUNTU_KERNEL=${AMP_KERNEL:-"linux-image-virtual"}
fi
AMP_ENABLE_CPUPINNING=${AMP_ENABLE_CPUPINNING:-0}
AMP_DISABLE_SSHD=${AMP_DISABLE_SSHD:-0}
AMP_PACKAGE_INSTALL=${AMP_PACKAGE_INSTALL:-0}
@ -476,6 +483,11 @@ AMP_element_sequence="$AMP_element_sequence pip-cache"
# Add certificate ramfs element
AMP_element_sequence="$AMP_element_sequence certs-ramfs"
# Add cpu-pinning element
if [ "$AMP_ENABLE_CPUPINNING" -eq 1 ]; then
AMP_element_sequence="$AMP_element_sequence cpu-pinning"
fi
# Disable SSHD if requested
if [ "$AMP_DISABLE_SSHD" -eq 1 ]; then
AMP_element_sequence="$AMP_element_sequence remove-sshd"

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@ -0,0 +1,6 @@
Element to enable optimizations for vertical scaling
This element configures the Linux kernel to isolate all but the first
vCPU of the system, so that they are used by HAProxy threads exclusively.
It also installs and activates a customized TuneD profile that should further
tweak vertical scaling performance.

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@ -0,0 +1,2 @@
install-static
package-installs

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@ -0,0 +1,36 @@
#!/bin/bash
#
# Copyright Red Hat
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
set -x
fi
set -euo pipefail
case $DISTRO_NAME in
ubuntu | debian | fedora | centos* | rhel* )
DIB_BOOTLOADER_DEFAULT_CMDLINE+=" irqaffinity=0"
# This will be ignored on single vCPU systems
DIB_BOOTLOADER_DEFAULT_CMDLINE+=" isolcpus=1-N"
export DIB_BOOTLOADER_DEFAULT_CMDLINE
;;
*)
echo "ERROR: Unsupported distribution $DISTRO_NAME"
exit 1
;;
esac

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@ -0,0 +1,3 @@
irqbalance:
uninstall: True
tuned:

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@ -0,0 +1,11 @@
#!/bin/bash
if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
set -x
fi
set -euo pipefail
if [ "$DIB_INIT_SYSTEM" == "systemd" ]; then
systemctl enable $(svc-map tuned)
fi

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@ -0,0 +1,3 @@
#!/bin/sh
chmod +x /usr/lib/tuned/amphora/script.sh

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@ -0,0 +1 @@
virtual-guest optimize-serial-console amphora

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@ -0,0 +1,23 @@
#!/bin/sh
# Comment the line in ...tuned/functions that fails on the amp:
# DISKS_SYS="$(command ls -d1 /sys/block/{sd,cciss,dm-,vd,dasd,xvd}* 2>/dev/null)"
sed -i 's/^DISKS_SYS=/#&/' /usr/lib/tuned/functions
. /usr/lib/tuned/functions
start() {
setup_kvm_mod_low_latency
disable_ksm
return "$?"
}
stop() {
if [ "$1" = "full_rollback" ]; then
teardown_kvm_mod_low_latency
enable_ksm
fi
return "$?"
}
process $@

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@ -0,0 +1,67 @@
#
# tuned configuration
#
# Copyright Red Hat
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
[main]
summary=Customized profile for use on Octavia amphorae
include=network-latency
[variables]
isolated_cores=${f:cpulist_invert:0}
no_balance_cores=${isolated_cores}
# Fail if isolated_cores are not set
assert1=${f:assertion_non_equal:isolated_cores are set:${isolated_cores}:${isolated_cores_assert_check}}
# tmpdir
tmpdir=${f:strip:${f:exec:mktemp:-d}}
isolated_cores_expanded=${f:cpulist_unpack:${isolated_cores}}
isolated_cpumask=${f:cpulist2hex:${isolated_cores_expanded}}
not_isolated_cores_expanded=${f:cpulist_invert:${isolated_cores_expanded}}
isolated_cores_online_expanded=${f:cpulist_online:${isolated_cores}}
not_isolated_cores_online_expanded=${f:cpulist_online:${not_isolated_cores_expanded}}
not_isolated_cpumask=${f:cpulist2hex:${not_isolated_cores_expanded}}
# Make sure no_balance_cores is defined before
# no_balance_cores_expanded is defined, so that child profiles can set
# no_balance_cores directly in the profile (tuned.conf)
no_balance_cores_expanded=${f:cpulist_unpack:${no_balance_cores}}
# Fail if isolated_cores contains CPUs which are not online
assert2=${f:assertion:isolated_cores contains online CPU(s):${isolated_cores_expanded}:${isolated_cores_online_expanded}}
[sysctl]
kernel.numa_balancing=0
kernel.hung_task_timeout_secs = 600
vm.stat_interval = 10
# See https://bugzilla.redhat.com/show_bug.cgi?id=1797629
kernel.timer_migration = 0
[sysfs]
/sys/bus/workqueue/devices/writeback/cpumask = ${not_isolated_cpumask}
/sys/devices/virtual/workqueue/cpumask = ${not_isolated_cpumask}
/sys/devices/virtual/workqueue/*/cpumask = ${not_isolated_cpumask}
/sys/devices/system/machinecheck/machinecheck*/ignore_ce = 1
[systemd]
cpu_affinity=${not_isolated_cores_expanded}
[script]
script=${i:PROFILE_DIR}/script.sh
[scheduler]
isolated_cores=${isolated_cores}
ps_blacklist=.*pmd.*;.*PMD.*;^DPDK;.*qemu-kvm.*;^contrail-vroute$;^lcore-slave-.*;^rte_mp_handle$;^rte_mp_async$;^eal-intr-thread$

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@ -0,0 +1,4 @@
tuned:
default: tuned
irqbalance:
default: irqbalance

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@ -0,0 +1,19 @@
---
features:
- |
The new "cpu-pinning" element optimizes the amphora image for better
vertical scaling. When an amphora flavor with multiple vCPUs is configured
it will configure the kernel to isolate (isolcpus)
all vCPUs except the first one.
Furthermore, it uninstalls irqbalance and sets the IRQ affinity to the
first CPU. That way the other CPUs are free to be used by HAProxy
exclusively. A new customized TuneD profile applies some more tweaks
for improving network latency.
This new feature is disabled by default, but can be enabled by running
`diskimage-create.sh` with the `-m` option or setting the
`AMP_ENABLE_CPUPINNING` environment variable to 1 before running the script.
upgrade:
- |
Amphora vertical scaling optimizations require a new amphora image
build with the optional CPU pinning feature enabled in order
to become effective.