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Disable atkbd0 and atkdbc0 in EC2 AMIs. This has the effect of skipping

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the probing and attaching of the PS/2 mouse (not present on EC2) and
keyboard (emulated, but not accessible via EC2).

Note that we disable atkbd0 separately even though during device probing
it shows up as a child of atkbdc0; this is necessary because the device
is also initialized during the early console setup from hammer_time.

This change cuts the kernel boot time on an EC2 c5.4xlarge instance from
7259ms down to 4727 ms.

Approved by:	re (marius)
This commit is contained in:
Colin Percival 2018-08-26 03:56:54 +00:00
parent 00d5b07760
commit a1b042f79d
1 changed files with 7 additions and 0 deletions
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7
release/tools/ec2.conf
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@ -68,6 +68,13 @@ vm_extra_pre_umount() {
echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf
echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf
# The emulated keyboard attached to EC2 instances is inaccessible to
# users, and there is no mouse attached at all; disable to keyboard
# and the keyboard controller (to which the mouse would attach, if
# one existed) in order to save time in device probing.
echo 'hint.atkbd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
echo 'hint.atkbdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
# EC2 has two consoles: An emulated serial port ("system log"),
# which has been present since 2006; and a VGA console ("instance
# screenshot") which was introduced in 2016.