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Groups > linux.debian.kernel > #65946

Bug#947759: Configuration optimizations for the cloud variant

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On Mon, 2019-12-30 at 00:03 -0800, Josh Triplett wrote:
> Source: linux
> Severity: wishlist
> 
> A few requests for changes to the cloud configuration:

Most of this looks reasonable, but:

> - Please disable CONFIG_ACPI_BGRT; a cloud kernel doesn't need to spend
>   time or code space looking for a boot logo that won't exist.
> 
> - Please disable the CONFIG_CPU_SUP_* options for CPUs that no cloud
>   provider uses.
> 
> - Please disable CONFIG_GNSS_*, which won't be hooked up to a cloud
>   server.
> 
> - Please disable CONFIG_GTP for the same reason.
> 
> - Please configure CONFIG_INPUT_MOUSEDEV as a module, not built-in, as
>   most cloud servers won't have a mouse and probing for one takes time.
> 
> - Please consider changing the default kernel compression to GZIP, which
>   decompresses faster and thus boots faster.

LZO or LZ4 could be even faster.

> - Please change CONFIG_NET_MPLS_GSO from y to m (and consider doing this
>   for the non-cloud kernel too); it doesn't need to be built into the
>   kernel.

Unfortunately nothing will load it if it's a module.  It's also a tiny
piece of code.  This might still be justifiable on the basis of
reducing the default attack surface though.

> - Please change CONFIG_NF_NAT_* and CONFIG_NF_MASQUERADE_* from y to m,
>   as many systems won't need those modules and shouldn't need to load
>   their code.

Some of those are boolean options, and I believe all of those that can
be modular already are.  You'll have to be more specific.

> - Please compile in the NVME driver and the EXT4 filesystem; this will
>   allow many cloud systems to avoid using an initramfs at all, which
>   substantially improves boot time.
> 
> - Please disable CONFIG_NUMA_EMU, only used to create fake-NUMA systems
>   for debugging.
> 
> - Please disable CONFIG_PCIPCWATCHDOG, CONFIG_PPS, and CONFIG_RMI4_*,
>   which won't appear on a cloud server.

Hyper-V and KVM both support PTP clocks, and PTP_1588_CLOCK selects
PPS.

> - Please enable CONFIG_SCHED_MC_PRIO (on both cloud and non-cloud
>   kernels).
> 
> - Please disable CONFIG_VFIO_PCI_VGA and CONFIG_VGA_SWITCHEROO, which
>   won't appear on cloud.

Ben.

-- 
Ben Hutchings
Experience is what causes a person to make new mistakes
instead of old ones.

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Bug#947759: Configuration optimizations for the cloud variant Josh Triplett <josh@joshtriplett.org> - 2019-12-30 09:10 +0100
  Bug#947759: Configuration optimizations for the cloud variant Ben Hutchings <ben@decadent.org.uk> - 2019-12-31 18:10 +0100
    Bug#947759: Configuration optimizations for the cloud variant Josh Triplett <josh@joshtriplett.org> - 2020-01-01 00:40 +0100
      Bug#947759: Configuration optimizations for the cloud variant Josh Triplett <josh@joshtriplett.org> - 2020-01-21 01:50 +0100
        Bug#947759: Configuration optimizations for the cloud variant Noah Meyerhans <noahm@debian.org> - 2020-01-21 03:00 +0100
          Bug#947759: Configuration optimizations for the cloud variant Noah Meyerhans <noahm@debian.org> - 2020-02-04 21:10 +0100
            Bug#947759: Configuration optimizations for the cloud variant Josh Triplett <josh@joshtriplett.org> - 2020-02-05 01:00 +0100
              Bug#947759: Configuration optimizations for the cloud variant Noah Meyerhans <noahm@debian.org> - 2020-02-05 22:40 +0100
                Bug#947759: Configuration optimizations for the cloud variant Josh Triplett <josh@joshtriplett.org> - 2020-02-06 03:00 +0100
  Bug#947759: marked as done (Configuration optimizations for the  cloud variant) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2020-04-17 05:10 +0200

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