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
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@ -27,6 +27,7 @@ case $DISTRO_NAME in
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DIB_BOOTLOADER_DEFAULT_CMDLINE+=" irqaffinity=0"
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# This will be ignored on single vCPU systems
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DIB_BOOTLOADER_DEFAULT_CMDLINE+=" isolcpus=1-N"
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DIB_BOOTLOADER_DEFAULT_CMDLINE+=" nohz=on nohz_full=1-N"
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export DIB_BOOTLOADER_DEFAULT_CMDLINE
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;;
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*)
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@ -0,0 +1,13 @@
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---
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features:
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- |
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The cpu-pinning element for the amphora image sets the kernel bootarg
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nohz_full=1-N to enable
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full dynticks on all CPUs except the first one (on single CPU images this
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will have no effect). This should reduce kernel noise on those CPUs to a
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minimum and reduce latency.
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upgrade:
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- |
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In order for the full dynticks optimization to become effective a new
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amphora image needs to be built with the new optional CPU pinning
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feature enabled.
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