[Debian-eeepc-devel] Using a pre-populated /dev for faster boot

[Phil Endecott]

Phil Endecott wrote:
> Phil Endecott wrote:
>> - Setting the clock takes up to a second.  But I don't think it would 
>> if we didn't have to use --directisa.
>
> It turns out that it still takes up to a second even when hwclock is 
> reading from /dev/rtc; it still waits for the time to tick over to the 
> next second.  Not using --directisa just means that it is idle wile 
> waiting for the tickover, rather than polling.  It's still on the 
> critical path for the boot.
>
> I think I'd be quite happy for my clock to be +/- half a second, at 
> least until NTP has started, but hwclock doesn't seem to have an option 
> for this.

This patch:

   http://chezphil.org/tmp/hwclock-add-notickwait.patch

adds a new option, --notickwait, to hwclock.  This causes it to not 
wait for the hardware clock to tick over, saving on average half a 
second per invocation but meaning that your clock will be on average 
half a second out.


Phil.