From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter =?utf-8?q?M=C3=BCller?= <peter.mueller@ipfire.org>
To: development@lists.ipfire.org
Subject: Re: [PATCH 01/13] kernel: Change timer tick to 1000Hz
Date: Sat, 18 Sep 2021 16:09:28 +0000
Message-ID: <ad925273-abfd-4b2e-649d-0a684763e341@ipfire.org>
In-Reply-To: <20210917114229.10704-1-michael.tremer@ipfire.org>
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Acked-by: Peter M=C3=BCller <peter.mueller(a)ipfire.org>


> This change is required to make the system respond faster to any
> realtime events (sending or receiving data packets).
>=20
> It will wake up at least one core 1000 times a second which will result
> in finer timer granularity and make scheduling smoother. HTB for
> example sends large packet bursts on each timer even to keep up data
> rates which is not helpful for most applications.
>=20
> The change might increase resource consumption and overhead slightly on
> some systems, but since we are running in an idle-dyntick configuration,
> we should not keep awake any cores that have not been awake before.
>=20
> Signed-off-by: Michael Tremer <michael.tremer(a)ipfire.org>
> ---
>   config/kernel/kernel.config.aarch64-ipfire | 6 +++---
>   config/kernel/kernel.config.armv6l-ipfire  | 6 +++---
>   config/kernel/kernel.config.i586-ipfire    | 6 +++---
>   config/kernel/kernel.config.x86_64-ipfire  | 6 +++---
>   4 files changed, 12 insertions(+), 12 deletions(-)
>=20
> diff --git a/config/kernel/kernel.config.aarch64-ipfire b/config/kernel/ker=
nel.config.aarch64-ipfire
> index 450835d8b..54cd7c084 100644
> --- a/config/kernel/kernel.config.aarch64-ipfire
> +++ b/config/kernel/kernel.config.aarch64-ipfire
> @@ -370,11 +370,11 @@ CONFIG_NR_CPUS=3D8
>   CONFIG_HOTPLUG_CPU=3Dy
>   # CONFIG_NUMA is not set
>   CONFIG_HOLES_IN_ZONE=3Dy
> -CONFIG_HZ_100=3Dy
> +# CONFIG_HZ_100 is not set
>   # CONFIG_HZ_250 is not set
>   # CONFIG_HZ_300 is not set
> -# CONFIG_HZ_1000 is not set
> -CONFIG_HZ=3D100
> +CONFIG_HZ_1000=3Dy
> +CONFIG_HZ=3D1000
>   CONFIG_SCHED_HRTICK=3Dy
>   CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=3Dy
>   CONFIG_ARCH_SPARSEMEM_ENABLE=3Dy
> diff --git a/config/kernel/kernel.config.armv6l-ipfire b/config/kernel/kern=
el.config.armv6l-ipfire
> index b1af6555c..6fe17954d 100644
> --- a/config/kernel/kernel.config.armv6l-ipfire
> +++ b/config/kernel/kernel.config.armv6l-ipfire
> @@ -588,13 +588,13 @@ CONFIG_HOTPLUG_CPU=3Dy
>   CONFIG_ARM_PSCI=3Dy
>   CONFIG_ARCH_NR_GPIO=3D512
>   CONFIG_HZ_FIXED=3D0
> -CONFIG_HZ_100=3Dy
> +# CONFIG_HZ_100 is not set
>   # CONFIG_HZ_200 is not set
>   # CONFIG_HZ_250 is not set
>   # CONFIG_HZ_300 is not set
>   # CONFIG_HZ_500 is not set
> -# CONFIG_HZ_1000 is not set
> -CONFIG_HZ=3D100
> +CONFIG_HZ_1000=3Dy
> +CONFIG_HZ=3D1000
>   CONFIG_SCHED_HRTICK=3Dy
>   CONFIG_ARM_PATCH_IDIV=3Dy
>   CONFIG_AEABI=3Dy
> diff --git a/config/kernel/kernel.config.i586-ipfire b/config/kernel/kernel=
.config.i586-ipfire
> index 5f5a496a8..a915682e4 100644
> --- a/config/kernel/kernel.config.i586-ipfire
> +++ b/config/kernel/kernel.config.i586-ipfire
> @@ -438,11 +438,11 @@ CONFIG_X86_INTEL_TSX_MODE_OFF=3Dy
>   # CONFIG_X86_INTEL_TSX_MODE_AUTO is not set
>   CONFIG_EFI=3Dy
>   CONFIG_EFI_STUB=3Dy
> -CONFIG_HZ_100=3Dy
> +# CONFIG_HZ_100 is not set
>   # CONFIG_HZ_250 is not set
>   # CONFIG_HZ_300 is not set
> -# CONFIG_HZ_1000 is not set
> -CONFIG_HZ=3D100
> +CONFIG_HZ_1000=3Dy
> +CONFIG_HZ=3D1000
>   CONFIG_SCHED_HRTICK=3Dy
>   # CONFIG_KEXEC is not set
>   CONFIG_CRASH_DUMP=3Dy
> diff --git a/config/kernel/kernel.config.x86_64-ipfire b/config/kernel/kern=
el.config.x86_64-ipfire
> index f8289aeb8..730e0791e 100644
> --- a/config/kernel/kernel.config.x86_64-ipfire
> +++ b/config/kernel/kernel.config.x86_64-ipfire
> @@ -430,11 +430,11 @@ CONFIG_X86_INTEL_TSX_MODE_OFF=3Dy
>   CONFIG_EFI=3Dy
>   CONFIG_EFI_STUB=3Dy
>   CONFIG_EFI_MIXED=3Dy
> -CONFIG_HZ_100=3Dy
> +# CONFIG_HZ_100 is not set
>   # CONFIG_HZ_250 is not set
>   # CONFIG_HZ_300 is not set
> -# CONFIG_HZ_1000 is not set
> -CONFIG_HZ=3D100
> +CONFIG_HZ_1000=3Dy
> +CONFIG_HZ=3D1000
>   CONFIG_SCHED_HRTICK=3Dy
>   # CONFIG_KEXEC is not set
>   # CONFIG_KEXEC_FILE is not set
>=20

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