[coreboot] Success in booting the kernel in less that 1 second on the x60

[ron minnich]

If you all get this take it to FOSDEM!

BTW I need a tiny kernel for u-root, how small can you get it at this point?

ron

On Fri Dec 12 2014 at 9:51:46 PM Charles Devereaux <coreboot at guylhem.net>
wrote:

> On Wed, Jul 2, 2014 at 10:48 AM, ron minnich <rminnich at gmail.com> wrote:
>>
>> This is great. We've gotten an acer c720 down to 1.7 seconds from power
>> button to chromeos login screen. I've always wanted to get it done in under
>> a second. I hope you can get there!
>>
>
> It looks quite possible.
>
> I couldn't sleep much last night, so I burned the midnight oil to achieve
> my goal of a *real fast* boot, building on the i915.fastboot improvements.
>
> It may have taken 4 months, but I could finally trim the kernel boot time
> to about 0.8s after further hackish fixes - like starting the scsi and sata
> drivers before the tty and char drivers, enabling paralllel probe for ahci,
> making psmouse a module because it was delaying boot too much, etc.
>
> If you use systemd with the configuration files I suggested before, your
> system should now be ready 1.4s after coreboot started grub.
>
> If you trim further (ex: turning more things into modules, removing the
> initrd) you can get the kernel ready in about 0.6s, so that'll mean about
> 1.2 seconds.
>
> It should be possible to beat the c720 boot time if coreboot could finish
> in about 0.5s on the x60, but I don't know how plausible this is. Ideas or
> suggestions would be welcome.
>
> If anyone is interested in replicating or improving these results, please
> use the following kernel patch on a vanillla 3.14.25 to compile a kernel
> using x60.config, then use the following command line in grub:
> libahci.ignore_sss=1 raid=noautodetect i915.fastboot=1
> i915.lvds_downclock=1 i915.i915_enable_rc6=7 nohz=on nmi_watchdog=0
> pcie=aspm thinkpad_acpi.brightness_enable=0 thinkpad_acpi.force_load=1
> thinkpad_acpi.fan_control=1 snd-hda-intel.index=0
> snd_hda_intel.power_save=10 snd_hda_intel.model=thinkpad
> snd-hda-intel.probe_mask=0x103 snd-pcsp.index=1 btusb.reset=1
> ath9k.ps_enable=1 ath9k.btcoex_enable=1 swap=/dev/sda2 tpm_tis.force=1
> tpm_tis.interrupts=0 tpm_tis.hid=PNP0C31 quiet systemd.unit=graphical.target
>
> Turning say alsa and firewire into  modules you can shave another 0.1 to
> 0.2s. I just tested that before posting. However, I'm not sure it's worth
> the trouble for now. Coreboot takes more time than the kernel+systemd, so
> it has become the limiting factor for further improvements.
>
> BTW, to demonstrate other optimisations (ex: obtaining a dhcp lease
> quickly) I will try to upload a minimal distribution based on
> debian-testing but making heavy use of clean systemd scripts, for those who
> want to have the quick boot without wasting too much time on configuration.
>
> Enjoy,
> Charles
>
>
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