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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