Gentoo/Linux Configuration Common

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Alonbl's base kernel configuration

Following is basic kernel configuration I use for all my computer.

I try to make the kernel configuration as smaller as I can, trying to make sure I understand why I add an feature.

I also try to use modules as much as I can to see dependency and be able to see references.


Linux Kernel Configuration:
  General setup  --->
    [*] Prompt for development and/or incomplete code/drivers
    [*] Support for paging of anonymous memory (swap)
    [*] Initial RAM filesystem and RAM disk (initramfs/initrd) support
    [*] System V IPC                                                  ### apache
    -*- Export task/process statistics through netlink (EXPERIMENTAL) ### iotop
    -*-   Enable per-task delay accounting (EXPERIMENTAL)             ### iotop
    [*]   Enable extended accounting over taskstats (EXPERIMENTAL)    ### iotop
    [*]     Enable per-task storage I/O accounting (EXPERIMENTAL)     ### iotop
  [*] Enable loadable module support  --->
    [*]   Module unloading
    [*]   Module versioning support
  -*- Enable the block layer  --->
    [*]   Block layer SG support v4
  [*] Enable loadable module support  --->
    [*]   Module unloading
    [*]   Module versioning support
  IO Schedulers  --->
    <M> CFQ I/O scheduler
    [*]   CFQ Group Scheduling support
    Default I/O scheduler (No-op)  --->
  Processor type and features  --->
    [*] Tickless System (Dynamic Ticks)
    [*] High Resolution Timer Support                                  ### Workstation
    [*] Symmetric multi-processing support
    [*] Single-depth WCHAN output
    (2) Maximum number of CPUs                                         ### Update to match machine
    [*] Multi-core scheduler support
    [*] Machine Check / overheating reporting
    [*]   Intel MCE features
    [*] Sparse Memory virtual memmap
  Power management and ACPI options  --->
    [*] ACPI (Advanced Configuration and Power Interface) Support  --->
      -*-   Button
    CPU Frequency scaling  --->
      [*] CPU Frequency scaling
      <M>   CPU frequency translation statistics
      [*]     CPU frequency translation statistics details
      Default CPUFreq governor (performance)  --->
      x86 CPU frequency scaling drivers  --->
        <M> ACPI Processor P-States drivers
    -*- CPU idle PM support
    [*]   Cpuidle Driver for Intel Processors
  Bus options (PCI etc.)  --->
    [*] PCI support
    [*]   Support mmconfig PCI config space access
    [*]   PCI Express support
    [*] Message Signaled Interrupts (MSI and MSI-X)
    [*] Interrupts on hypertransport devices
  Executable file formats / Emulations  --->
    [*] Kernel support for ELF binaries
  [*] Networking support  --->
    Networking options  --->
      <M> Packet socket
      <M> Unix domain sockets
      [*] TCP/IP networking
      [*]   IP: TCP syncookie support
      <M>   Large Receive Offload (ipv4/tcp)
      <M>   INET: socket monitoring interface
      [*]   TCP: advanced congestion control  --->
        <*>   CUBIC TCP
        Default TCP congestion control (Cubic)  --->
      [*] Security Marking 
  Device Drivers  --->
    Generic Driver Options  --->
      [*] Select only drivers that don't need compile-time external firmware
      [*] Prevent firmware from being built
      -*- Userspace firmware loading support
    <*> Connector - unified userspace <-> kernelspace linker  --->
      [*]   Report process events to userspace
    Input device support  --->
      <M>   Event interface
      [*]   Miscellaneous devices  --->
      -*-   Keyboards  --->
      [*]   Mice  --->
        <M>   PS/2 mouse 
      [*]   Miscellaneous devices  --->
        <M>   PC Speaker support
    Character devices  --->
      [*] HPET - High Precision Event Timer
      [*]   Allow mmap of HPET
    [*] USB support  --->
      <M>   Support for Host-side USB
      [*]     USB runtime power management (autosuspend) and wakeup
      <M>   USB Monitoring
      <M>   EHCI HCD (USB 2.0) support
      <M>   OHCI HCD support
      <M>   UHCI HCD (most Intel and VIA) support
      <M>   USB Mass Storage support
    [*] Real Time Clock  --->
      [*]   Set system time from RTC on startup and resume
      (rtc0)  RTC used to set the system time
      [*]   /sys/class/rtc/rtcN (sysfs)
      [*]   /dev/rtcN (character devices)
      <M>   PC-style 'CMOS'
    [*] DMA Engine support  --->
      <M>   Intel I/OAT DMA support
      [*]   Network: TCP receive copy offload
    [*] IOMMU Hardware Support  --->
      [*]   Support for DMA Remapping Devices
      [*]     Enable DMA Remapping Devices by default
      [*]   Support for Interrupt Remapping (EXPERIMENTAL)
    File systems  --->
      <M> The Extended 4 (ext4) filesystem                       ### you may  want to set as <*> to avoid complex initramfs
      [*]   Use ext4 for ext2/ext3 file systems
      [*]   Ext4 extended attributes
      [*]     Ext4 POSIX Access Control Lists
      [*]     Ext4 Security Labels
      [*] Inotify support for userspace
      Pseudo filesystems  --->
        [*]   Tmpfs POSIX Access Control Lists
        -*-   Tmpfs extended attributes
  Kernel hacking  --->
    [*] Kernel debugging                                          ### powertop
    [*] Collect kernel timers statistics                          ### powertop
    [*] Tracers  --->                                             ### powertop
      [*]   Trace process context switches and events             ### powertop
    [*] Write protect kernel read-only data structures

Also apply Gentoo/Firewall_Using_Firehol kernel configuration.

OpenRC cgroup integration:

Linux Kernel Configuration:
  General setup  --->
    [*] Control Group support  --->
      [*]   Freezer cgroup subsystem
      [*]   Device controller for cgroups
      [*]   Cpuset support
      [*]   Simple CPU accounting cgroup subsystem
      [*]   Group CPU scheduler  --->
        [*]   Group scheduling for SCHED_OTHER
        [*]   Group scheduling for SCHED_RR/FIFO
      <M>   Block IO controller
  IO Schedulers  --->
    <M> CFQ I/O scheduler
    [*]   CFQ Group Scheduling support
File: /etc/conf.d/modules
File: /etc/local.d/iosched.start
find /sys/class/block/*/. -name scheduler | while read f; do echo cfq > "$f"; done
exit 0


Alon Bar-Lev


Originally written by: Alon Bar-Lev - 2011-11-25

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