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Re: Slow boot

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On 11/01/19 3:27 PM, Felix Miata wrote:
> Richard Hector composed on 2019-01-11 14:03 (UTC+1300):
> 
>> This machine is taking ages to boot.
> 
>> It's a fresh install.
> 
>> According to dmesg, this is where it appears to hang:
> 
>> [    2.717311] device-mapper: uevent: version 1.0.3
>> [    2.717398] device-mapper: ioctl: 4.35.0-ioctl (2016-06-23)
>> initialised: dm-d
>> evel@redhat.com
>> [    2.978281] clocksource: Switched to clocksource tsc
>> [  121.459392] md: linear personality registered for level -1
>> [  121.460391] md: multipath personality registered for level -4
>> [  121.461444] md: raid0 personality registered for level 0
> 
>> I have started wondering recently about the hardware - could I have a
>> clock problem?
> 
>> None of the other 'clocksource' entries have a similar lag, and there's
>> no similar lag at that point on my desktop.
> 
>> Do I need to provide more context, or do more diagnostics?
> 
> Possibly kernel-parameters.txt has a clock suggestion, maybe
> 
> 	clocksource=hpet
> 
> or forcing tsc from cmdline would switch to it at a more opportune time?
> 

Thanks Felix.

Well that's interesting - if I put clocksource=hpet on the kernel
command line, it still pauses at the same place, but the clocksource
message isn't there - which seems to me to eliminate it as the source of
the problem. (when I use clocksource=tsc, that line does appear as before)

But then I also got rid of those md messages by blacklisting the
modules, so now I have different messages both sides of the hang.

So either there's something else unlogged happening between, or there's
parallelism happening. Either way, I'm not sure where to look next :-(

Hints on where to look for the boot sequence in the kernel source, perhaps?

Cheers,
Richard

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Thread

Slow boot Richard Hector <richard@walnut.gen.nz> - 2019-01-11 02:10 +0100
  Re: Slow boot Felix Miata <mrmazda@earthlink.net> - 2019-01-11 03:30 +0100
    Re: Slow boot Richard Hector <richard@walnut.gen.nz> - 2019-01-11 05:00 +0100
      Re: Slow boot Felix Miata <mrmazda@earthlink.net> - 2019-01-11 07:50 +0100
      Re: Slow boot Curt <curty@free.fr> - 2019-01-11 09:50 +0100
  Re: Slow boot Dan Ritter <dsr@randomstring.org> - 2019-01-11 13:00 +0100
    Re: Slow boot Cindy-Sue Causey <butterflybytes@gmail.com> - 2019-01-11 13:20 +0100
      Re: Slow boot Dan Ritter <dsr@randomstring.org> - 2019-01-11 14:40 +0100
        Re: Slow boot Cindy-Sue Causey <butterflybytes@gmail.com> - 2019-01-11 23:00 +0100
  Re: Slow boot David <bouncingcats@gmail.com> - 2019-01-11 13:30 +0100
    Re: Slow boot deloptes <deloptes@gmail.com> - 2019-01-11 17:20 +0100
    Re: Slow boot Richard Hector <richard@walnut.gen.nz> - 2019-01-12 04:50 +0100
      Re: Slow boot Richard Hector <richard@walnut.gen.nz> - 2019-01-12 05:30 +0100
  Re: Slow boot David <bouncingcats@gmail.com> - 2019-01-11 13:40 +0100
  Re: Slow boot Michael Stone <mstone@debian.org> - 2019-01-11 15:50 +0100
    Re: Slow boot Richard Hector <richard@walnut.gen.nz> - 2019-01-12 04:50 +0100

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