Remove option to disable NUMA

The first reports of positive impact of disabling NUMA for desktop systems date back to 2012 [1], and even then they were extremely minor and at margin of error level of ~300ms at kernel compilation. Now more than 10 years have passed, there have been many NUMA-related changes in kernel over the years and it probably makes no sense to say that disabling NUMA provides any benefits. I haven't found any relevant performance comparisons with NUMA disabled, if someone provides them and shows evidence that it may still be necessary - I'm happy to revert this change. I should also note that some schedulers like PDS and BMQ forcibly disable NUMA because they do not have a proper implementation of its support. [1] - https://bugs.archlinux.org/task/31187 Signed-off-by: Vasiliy Stelmachenok <[email protected]>
CachyOS · Feb 8, 2025 · 5588a00 · 5588a00
1 parent f0dca2c
commit 5588a00
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diff --git a/linux-cachyos-bmq/PKGBUILD b/linux-cachyos-bmq/PKGBUILD
@@ -28,12 +28,6 @@
 ### Tweak kernel options prior to a build via xconfig
 : "${_makexconfig:=no}"
 
-# NUMA is optimized for multi-socket motherboards.
-# A single multi-core CPU actually runs slower with NUMA enabled.
-# See, https://bugs.archlinux.org/task/31187
-# It seems that in 2023 this is not really a huge regression anymore
-: "${_NUMAdisable:=no}"
-
 # Compile ONLY used modules to VASTLYreduce the number of modules built
 # and the build time.
 #
@@ -333,24 +327,6 @@ prepare() {
 
     echo "Setting tick rate to ${_HZ_ticks}Hz..."
 
-    ### Disable NUMA
-    if [ "$_NUMAdisable" = "yes" ]; then
-        echo "Disabling NUMA from kernel config..."
-        scripts/config -d NUMA \
-            -d AMD_NUMA \
-            -d X86_64_ACPI_NUMA \
-            -d NODES_SPAN_OTHER_NODES \
-            -d NUMA_EMU \
-            -d USE_PERCPU_NUMA_NODE_ID \
-            -d ACPI_NUMA \
-            -d ARCH_SUPPORTS_NUMA_BALANCING \
-            -d NODES_SHIFT \
-            -u NODES_SHIFT \
-            -d NEED_MULTIPLE_NODES \
-            -d NUMA_BALANCING \
-            -d NUMA_BALANCING_DEFAULT_ENABLED
-    fi
-
     ### Select performance governor
     if [ "$_per_gov" = "yes" ]; then
         echo "Setting performance governor..."

diff --git a/linux-cachyos-bore/PKGBUILD b/linux-cachyos-bore/PKGBUILD
@@ -28,12 +28,6 @@
 ### Tweak kernel options prior to a build via xconfig
 : "${_makexconfig:=no}"
 
-# NUMA is optimized for multi-socket motherboards.
-# A single multi-core CPU actually runs slower with NUMA enabled.
-# See, https://bugs.archlinux.org/task/31187
-# It seems that in 2023 this is not really a huge regression anymore
-: "${_NUMAdisable:=no}"
-
 # Compile ONLY used modules to VASTLYreduce the number of modules built
 # and the build time.
 #
@@ -333,24 +327,6 @@ prepare() {
 
     echo "Setting tick rate to ${_HZ_ticks}Hz..."
 
-    ### Disable NUMA
-    if [ "$_NUMAdisable" = "yes" ]; then
-        echo "Disabling NUMA from kernel config..."
-        scripts/config -d NUMA \
-            -d AMD_NUMA \
-            -d X86_64_ACPI_NUMA \
-            -d NODES_SPAN_OTHER_NODES \
-            -d NUMA_EMU \
-            -d USE_PERCPU_NUMA_NODE_ID \
-            -d ACPI_NUMA \
-            -d ARCH_SUPPORTS_NUMA_BALANCING \
-            -d NODES_SHIFT \
-            -u NODES_SHIFT \
-            -d NEED_MULTIPLE_NODES \
-            -d NUMA_BALANCING \
-            -d NUMA_BALANCING_DEFAULT_ENABLED
-    fi
-
     ### Select performance governor
     if [ "$_per_gov" = "yes" ]; then
         echo "Setting performance governor..."

diff --git a/linux-cachyos-deckify/PKGBUILD b/linux-cachyos-deckify/PKGBUILD
@@ -28,12 +28,6 @@
 ### Tweak kernel options prior to a build via xconfig
 : "${_makexconfig:=no}"
 
-# NUMA is optimized for multi-socket motherboards.
-# A single multi-core CPU actually runs slower with NUMA enabled.
-# See, https://bugs.archlinux.org/task/31187
-# It seems that in 2023 this is not really a huge regression anymore
-: "${_NUMAdisable:=no}"
-
 # Compile ONLY used modules to VASTLYreduce the number of modules built
 # and the build time.
 #
@@ -334,24 +328,6 @@ prepare() {
 
     echo "Setting tick rate to ${_HZ_ticks}Hz..."
 
-    ### Disable NUMA
-    if [ "$_NUMAdisable" = "yes" ]; then
-        echo "Disabling NUMA from kernel config..."
-        scripts/config -d NUMA \
-            -d AMD_NUMA \
-            -d X86_64_ACPI_NUMA \
-            -d NODES_SPAN_OTHER_NODES \
-            -d NUMA_EMU \
-            -d USE_PERCPU_NUMA_NODE_ID \
-            -d ACPI_NUMA \
-            -d ARCH_SUPPORTS_NUMA_BALANCING \
-            -d NODES_SHIFT \
-            -u NODES_SHIFT \
-            -d NEED_MULTIPLE_NODES \
-            -d NUMA_BALANCING \
-            -d NUMA_BALANCING_DEFAULT_ENABLED
-    fi
-
     ### Select performance governor
     if [ "$_per_gov" = "yes" ]; then
         echo "Setting performance governor..."

diff --git a/linux-cachyos-eevdf/PKGBUILD b/linux-cachyos-eevdf/PKGBUILD
@@ -28,12 +28,6 @@
 ### Tweak kernel options prior to a build via xconfig
 : "${_makexconfig:=no}"
 
-# NUMA is optimized for multi-socket motherboards.
-# A single multi-core CPU actually runs slower with NUMA enabled.
-# See, https://bugs.archlinux.org/task/31187
-# It seems that in 2023 this is not really a huge regression anymore
-: "${_NUMAdisable:=no}"
-
 # Compile ONLY used modules to VASTLYreduce the number of modules built
 # and the build time.
 #
@@ -333,24 +327,6 @@ prepare() {
 
     echo "Setting tick rate to ${_HZ_ticks}Hz..."
 
-    ### Disable NUMA
-    if [ "$_NUMAdisable" = "yes" ]; then
-        echo "Disabling NUMA from kernel config..."
-        scripts/config -d NUMA \
-            -d AMD_NUMA \
-            -d X86_64_ACPI_NUMA \
-            -d NODES_SPAN_OTHER_NODES \
-            -d NUMA_EMU \
-            -d USE_PERCPU_NUMA_NODE_ID \
-            -d ACPI_NUMA \
-            -d ARCH_SUPPORTS_NUMA_BALANCING \
-            -d NODES_SHIFT \
-            -u NODES_SHIFT \
-            -d NEED_MULTIPLE_NODES \
-            -d NUMA_BALANCING \
-            -d NUMA_BALANCING_DEFAULT_ENABLED
-    fi
-
     ### Select performance governor
     if [ "$_per_gov" = "yes" ]; then
         echo "Setting performance governor..."

diff --git a/linux-cachyos-hardened/PKGBUILD b/linux-cachyos-hardened/PKGBUILD
@@ -28,12 +28,6 @@
 ### Tweak kernel options prior to a build via xconfig
 : "${_makexconfig:=no}"
 
-# NUMA is optimized for multi-socket motherboards.
-# A single multi-core CPU actually runs slower with NUMA enabled.
-# See, https://bugs.archlinux.org/task/31187
-# It seems that in 2023 this is not really a huge regression anymore
-: "${_NUMAdisable:=no}"
-
 # Compile ONLY used modules to VASTLYreduce the number of modules built
 # and the build time.
 #
@@ -336,24 +330,6 @@ prepare() {
 
     echo "Setting tick rate to ${_HZ_ticks}Hz..."
 
-    ### Disable NUMA
-    if [ "$_NUMAdisable" = "yes" ]; then
-        echo "Disabling NUMA from kernel config..."
-        scripts/config -d NUMA \
-            -d AMD_NUMA \
-            -d X86_64_ACPI_NUMA \
-            -d NODES_SPAN_OTHER_NODES \
-            -d NUMA_EMU \
-            -d USE_PERCPU_NUMA_NODE_ID \
-            -d ACPI_NUMA \
-            -d ARCH_SUPPORTS_NUMA_BALANCING \
-            -d NODES_SHIFT \
-            -u NODES_SHIFT \
-            -d NEED_MULTIPLE_NODES \
-            -d NUMA_BALANCING \
-            -d NUMA_BALANCING_DEFAULT_ENABLED
-    fi
-
     ### Select performance governor
     if [ "$_per_gov" = "yes" ]; then
         echo "Setting performance governor..."

diff --git a/linux-cachyos-lts/PKGBUILD b/linux-cachyos-lts/PKGBUILD
@@ -28,12 +28,6 @@
 ### Tweak kernel options prior to a build via xconfig
 : "${_makexconfig:=no}"
 
-# NUMA is optimized for multi-socket motherboards.
-# A single multi-core CPU actually runs slower with NUMA enabled.
-# See, https://bugs.archlinux.org/task/31187
-# It seems that in 2023 this is not really a huge regression anymore
-: "${_NUMAdisable:=no}"
-
 # Compile ONLY used modules to VASTLYreduce the number of modules built
 # and the build time.
 #
@@ -334,24 +328,6 @@ prepare() {
 
     echo "Setting tick rate to ${_HZ_ticks}Hz..."
 
-    ### Disable NUMA
-    if [ "$_NUMAdisable" = "yes" ]; then
-        echo "Disabling NUMA from kernel config..."
-        scripts/config -d NUMA \
-            -d AMD_NUMA \
-            -d X86_64_ACPI_NUMA \
-            -d NODES_SPAN_OTHER_NODES \
-            -d NUMA_EMU \
-            -d USE_PERCPU_NUMA_NODE_ID \
-            -d ACPI_NUMA \
-            -d ARCH_SUPPORTS_NUMA_BALANCING \
-            -d NODES_SHIFT \
-            -u NODES_SHIFT \
-            -d NEED_MULTIPLE_NODES \
-            -d NUMA_BALANCING \
-            -d NUMA_BALANCING_DEFAULT_ENABLED
-    fi
-
     ### Select performance governor
     if [ "$_per_gov" = "yes" ]; then
         echo "Setting performance governor..."

diff --git a/linux-cachyos-rc/PKGBUILD b/linux-cachyos-rc/PKGBUILD
@@ -28,12 +28,6 @@
 ### Tweak kernel options prior to a build via xconfig
 : "${_makexconfig:=no}"
 
-# NUMA is optimized for multi-socket motherboards.
-# A single multi-core CPU actually runs slower with NUMA enabled.
-# See, https://bugs.archlinux.org/task/31187
-# It seems that in 2023 this is not really a huge regression anymore
-: "${_NUMAdisable:=no}"
-
 # Compile ONLY used modules to VASTLYreduce the number of modules built
 # and the build time.
 #
@@ -375,24 +369,6 @@ prepare() {
 
     echo "Setting tick rate to ${_HZ_ticks}Hz..."
 
-    ### Disable NUMA
-    if [ "$_NUMAdisable" = "yes" ]; then
-        echo "Disabling NUMA from kernel config..."
-        scripts/config -d NUMA \
-            -d AMD_NUMA \
-            -d X86_64_ACPI_NUMA \
-            -d NODES_SPAN_OTHER_NODES \
-            -d NUMA_EMU \
-            -d USE_PERCPU_NUMA_NODE_ID \
-            -d ACPI_NUMA \
-            -d ARCH_SUPPORTS_NUMA_BALANCING \
-            -d NODES_SHIFT \
-            -u NODES_SHIFT \
-            -d NEED_MULTIPLE_NODES \
-            -d NUMA_BALANCING \
-            -d NUMA_BALANCING_DEFAULT_ENABLED
-    fi
-
     ### Select performance governor
     if [ "$_per_gov" = "yes" ]; then
         echo "Setting performance governor..."

diff --git a/linux-cachyos-rt-bore/PKGBUILD b/linux-cachyos-rt-bore/PKGBUILD
@@ -28,12 +28,6 @@
 ### Tweak kernel options prior to a build via xconfig
 : "${_makexconfig:=no}"
 
-# NUMA is optimized for multi-socket motherboards.
-# A single multi-core CPU actually runs slower with NUMA enabled.
-# See, https://bugs.archlinux.org/task/31187
-# It seems that in 2023 this is not really a huge regression anymore
-: "${_NUMAdisable:=no}"
-
 # Compile ONLY used modules to VASTLYreduce the number of modules built
 # and the build time.
 #
@@ -333,24 +327,6 @@ prepare() {
 
     echo "Setting tick rate to ${_HZ_ticks}Hz..."
 
-    ### Disable NUMA
-    if [ "$_NUMAdisable" = "yes" ]; then
-        echo "Disabling NUMA from kernel config..."
-        scripts/config -d NUMA \
-            -d AMD_NUMA \
-            -d X86_64_ACPI_NUMA \
-            -d NODES_SPAN_OTHER_NODES \
-            -d NUMA_EMU \
-            -d USE_PERCPU_NUMA_NODE_ID \
-            -d ACPI_NUMA \
-            -d ARCH_SUPPORTS_NUMA_BALANCING \
-            -d NODES_SHIFT \
-            -u NODES_SHIFT \
-            -d NEED_MULTIPLE_NODES \
-            -d NUMA_BALANCING \
-            -d NUMA_BALANCING_DEFAULT_ENABLED
-    fi
-
     ### Select performance governor
     if [ "$_per_gov" = "yes" ]; then
         echo "Setting performance governor..."

diff --git a/linux-cachyos-server/PKGBUILD b/linux-cachyos-server/PKGBUILD
@@ -28,12 +28,6 @@
 ### Tweak kernel options prior to a build via xconfig
 : "${_makexconfig:=no}"
 
-# NUMA is optimized for multi-socket motherboards.
-# A single multi-core CPU actually runs slower with NUMA enabled.
-# See, https://bugs.archlinux.org/task/31187
-# It seems that in 2023 this is not really a huge regression anymore
-: "${_NUMAdisable:=no}"
-
 # Compile ONLY used modules to VASTLYreduce the number of modules built
 # and the build time.
 #
@@ -333,24 +327,6 @@ prepare() {
 
     echo "Setting tick rate to ${_HZ_ticks}Hz..."
 
-    ### Disable NUMA
-    if [ "$_NUMAdisable" = "yes" ]; then
-        echo "Disabling NUMA from kernel config..."
-        scripts/config -d NUMA \
-            -d AMD_NUMA \
-            -d X86_64_ACPI_NUMA \
-            -d NODES_SPAN_OTHER_NODES \
-            -d NUMA_EMU \
-            -d USE_PERCPU_NUMA_NODE_ID \
-            -d ACPI_NUMA \
-            -d ARCH_SUPPORTS_NUMA_BALANCING \
-            -d NODES_SHIFT \
-            -u NODES_SHIFT \
-            -d NEED_MULTIPLE_NODES \
-            -d NUMA_BALANCING \
-            -d NUMA_BALANCING_DEFAULT_ENABLED
-    fi
-
     ### Select performance governor
     if [ "$_per_gov" = "yes" ]; then
         echo "Setting performance governor..."

diff --git a/linux-cachyos/PKGBUILD b/linux-cachyos/PKGBUILD
@@ -28,12 +28,6 @@
 ### Tweak kernel options prior to a build via xconfig
 : "${_makexconfig:=no}"
 
-# NUMA is optimized for multi-socket motherboards.
-# A single multi-core CPU actually runs slower with NUMA enabled.
-# See, https://bugs.archlinux.org/task/31187
-# It seems that in 2023 this is not really a huge regression anymore
-: "${_NUMAdisable:=no}"
-
 # Compile ONLY used modules to VASTLYreduce the number of modules built
 # and the build time.
 #
@@ -374,24 +368,6 @@ prepare() {
 
     echo "Setting tick rate to ${_HZ_ticks}Hz..."
 
-    ### Disable NUMA
-    if [ "$_NUMAdisable" = "yes" ]; then
-        echo "Disabling NUMA from kernel config..."
-        scripts/config -d NUMA \
-            -d AMD_NUMA \
-            -d X86_64_ACPI_NUMA \
-            -d NODES_SPAN_OTHER_NODES \
-            -d NUMA_EMU \
-            -d USE_PERCPU_NUMA_NODE_ID \
-            -d ACPI_NUMA \
-            -d ARCH_SUPPORTS_NUMA_BALANCING \
-            -d NODES_SHIFT \
-            -u NODES_SHIFT \
-            -d NEED_MULTIPLE_NODES \
-            -d NUMA_BALANCING \
-            -d NUMA_BALANCING_DEFAULT_ENABLED
-    fi
-
     ### Select performance governor
     if [ "$_per_gov" = "yes" ]; then
         echo "Setting performance governor..."