Messages in this thread | | | Date | Wed, 21 May 2003 10:00:45 -0700 | From | Jerry Cooperstein <> | Subject | Re: Wrong clock initialization |
| |
This is not directly a kernel problem. I developed this after a glibc upgrade. The problem is most distros (such as redhat) make a symbolic link
/etc/localtime -> /usr/share/zoneinfo/America/Los_Angeles
or whatever your timezone is. On some of my systems, /usr/share is on a disk partition that is not mounted at the time the link is needed during initialization; the system then defaults to UTC. As a result, each time you boot up your system loses a time equal to the difference between UTC and your local time zone.
To fix this, just make sure /etc/localtime is actually a file on the root filesystem, not a link to a possibly unmounted filesystem. Just copy the one pointed to by the link.
I have systems with the same partition/mount layout which have no problem, so I don't know why some systems get confused. So far I have only seen this on laptops.
====================================================================== Jerry Cooperstein, Senior Consultant, <coop@axian.com> Axian, Inc., Software Consulting and Training 4800 SW Griffith Dr., Ste. 202, Beaverton, OR 97005 USA http://www.axian.com/ ======================================================================
On Tue, May 20, 2003 at 07:34:55PM +0200, David Balazic wrote: > Hi! > > When the kernel is booted ( ia32 version at least ) , it reads > the time from from the hardware CMOS clock , _assumes_ it is in > UTC and set the system time to it. > > As almost nobody runs their clock in UTC, this means that the system > is running on wrong time until some userspace tool corrects it. > > This can lead to situtation when time goes backwards : > > timezone is 2hours east of UTC. > UTC time : 20:00 > local time : 22:00 > > System time between boot and userspace fix : 22:00UTC > System time after fix : 20:00UTC > > Comments ? > > > -- > David Balazic > -------------- > "Be excellent to each other." - Bill S. Preston, Esq., & "Ted" Theodore > Logan > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - > - - - > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |