linux-kernel - Re: [BUG-RT] RTC has been stopped-> long delay during boot, soft reboot->GRUB fails to call getrtsecs()

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Date:	Tue, 2 Jan 2007 17:16:08 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	linux@...mer.net
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [BUG-RT] RTC has been stopped-> long delay during boot, soft reboot->GRUB fails to call getrtsecs()


* Remy Bohmer <l.pinguin@...il.com> wrote:

> Hello Ingo,
> 
> I have discovered 3 problems that are likely all related to the same
> root-cause, likely to be caused by the RT-kernel.
> I use the 2.6.19-rt15 kernel, with the configuration attached to this mail.
> It is running on a standard x86, i945, Celeron 2.93 GHZ (=UP), Fedora Core 6
> 
> So, I have set the following options:
> CONFIG_HIGH_RES_TIMERS=y
> CONFIG_NO_HZ=y
> 
> The problems:
> 1. During (cold and warm) boot the synchronisation of the hardware
> clock takes often very long time, up to approx. 30 seconds. (This is
> the call: /sbin/hwclock --hctosys --localtime)

i tried this on a recent -rt kernel and there's no delay:

  [root@...ope ~]# time /sbin/hwclock --hctosys --localtime

  real    0m0.756s
  user    0m0.754s
  sys     0m0.002s

could you try a more recent kernel like 2.6.20-rc2-rt3? We fixed a good 
number of high-res timers related bugs that could result in similar 
hangs. But maybe it's still unfixed, it's just a guess.

	Ingo
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