9 Feb
2016
9 Feb
'16
4:43 a.m.
On Mon, 8 Feb 2016 21:31:08 +0100, Jeremy Jongepier wrote:
On 02/08/2016 08:11 PM, Ralf Mardorf wrote:
A comparison between a standard Arch and an Ubuntu lowlatency kernel of
a few other things that come to mind on the fly:
[rocketmouse@archlinux ~]$ uname -r
4.4.1-2-ARCH
[rocketmouse@archlinux ~]$ zgrep THREADING_DEFAULT /proc/config.gz
[rocketmouse@archlinux ~]$ grep THREADING_DEFAULT
/mnt/moonstudio/boot/config-4.2.0-27-lowlatency
CONFIG_IRQ_FORCED_THREADING_DEFAULT=y
[rocketmouse@archlinux ~]$ zgrep Q_DEFAULT_GOV /proc/config.gz
# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
[rocketmouse@archlinux ~]$ grep -i Q_DEFAULT_GOV
/mnt/moonstudio/boot/config-4.2.0-27-lowlatency
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
[rocketmouse@archlinux ~]$ zgrep NO_HZ /proc/config.gz
CONFIG_NO_HZ_COMMON=y
CONFIG_NO_HZ_IDLE=y
# CONFIG_NO_HZ_FULL is not set
# CONFIG_NO_HZ is not set
[rocketmouse@archlinux ~]$ grep NO_HZ /mnt/moonstudio/boot/config-4.2.0-27-lowlatency
CONFIG_NO_HZ_COMMON=y
CONFIG_NO_HZ_IDLE=y
# CONFIG_NO_HZ_FULL is not set
CONFIG_NO_HZ=y
I forgot to mention, the lowlatency is a vanilla
kernel with a
special configuration, but without a realtime related patch.
Afaik the Ubuntu low-latency kernel doesn't really have a special
config, just CONFIG_PREEMPT and CONFIG_HZ_1000.