Set nohz_full in cpu-pinning element
nohz_full (or full dynticks) is a Linux kernel setting that should reduce kernel noise on configured CPUs to a minimum. This change activates this setting on all vCPUs except the first one. Change-Id: Ie009aff52d572873da0bb5cc43fedd7f3325dccc
This commit is contained in:
parent
0b1b6c58f5
commit
baefc3b464
|
@ -27,6 +27,7 @@ case $DISTRO_NAME in
|
||||||
DIB_BOOTLOADER_DEFAULT_CMDLINE+=" irqaffinity=0"
|
DIB_BOOTLOADER_DEFAULT_CMDLINE+=" irqaffinity=0"
|
||||||
# This will be ignored on single vCPU systems
|
# This will be ignored on single vCPU systems
|
||||||
DIB_BOOTLOADER_DEFAULT_CMDLINE+=" isolcpus=1-N"
|
DIB_BOOTLOADER_DEFAULT_CMDLINE+=" isolcpus=1-N"
|
||||||
|
DIB_BOOTLOADER_DEFAULT_CMDLINE+=" nohz=on nohz_full=1-N"
|
||||||
export DIB_BOOTLOADER_DEFAULT_CMDLINE
|
export DIB_BOOTLOADER_DEFAULT_CMDLINE
|
||||||
;;
|
;;
|
||||||
*)
|
*)
|
||||||
|
|
|
@ -0,0 +1,13 @@
|
||||||
|
---
|
||||||
|
features:
|
||||||
|
- |
|
||||||
|
The cpu-pinning element for the amphora image sets the kernel bootarg
|
||||||
|
nohz_full=1-N to enable
|
||||||
|
full dynticks on all CPUs except the first one (on single CPU images this
|
||||||
|
will have no effect). This should reduce kernel noise on those CPUs to a
|
||||||
|
minimum and reduce latency.
|
||||||
|
upgrade:
|
||||||
|
- |
|
||||||
|
In order for the full dynticks optimization to become effective a new
|
||||||
|
amphora image needs to be built with the new optional CPU pinning
|
||||||
|
feature enabled.
|
Loading…
Reference in New Issue