RE: NTP time sync

Joakim Tjernlund
2006-11-26T11:05:05Z

> -----Original Message-----
> From:
> linuxppc-dev-bounces+joakim.tjernlund=transmode.se@ozlabs.org
> [mailto:linuxppc-dev-bounces+joakim.tjernlund=transmode.se@ozl
> abs.org] On Behalf Of David Brownell
> Sent: den 26 november 2006 00:22
> To: Benjamin Herrenschmidt
> Cc: akpm@osdl.org; Alessandro Zummo; linuxppc-dev@ozlabs.org;
> lethal@linux-sh.org; Linux Kernel Mailing List;
> ralf@linux-mips.org; Andi Kleen; paulus@samba.org;
> rmk@arm.linux.org.uk; davem@davemloft.net; kkojima@rr.iij4u.or.jp
> Subject: Re: NTP time sync
>
> On Thursday 23 November 2006 3:00 am, Benjamin Herrenschmidt wrote:
> >
> > Couldn't we have a transition period by making the kernel
> not rely on
> > interrupts ? if the NTP irq code just triggers a work
> queue, then all of
> > a sudden, all of the RTC drivers can be used and the
> latency is small.
> > That might well be a good enough solution and is very simple.
>
> Good point. Of course, one issue is that the NTP sync code all
> seems to be platform-specific right now ... just like the code
> to set the system time from an RTC at boot (except for the new
> RTC framework stuff) and after resume.
>
> - Dave

Looking at rtc-dev.c I don't see a MARJOR number assigned to /dev/rtcN. Seems like
it is dynamically allocated to whatever major number that is free.
Is that the way it is supposed to be? How do I create a static /dev/rtcN in my /dev
directory if the major number isn't fixed?
Maybe I am just missing something, feel free to correct me :)

Jocke