I see an old reference to a problem on ia64 architecture where turning on CONFIG_PRINTK_TIME causes problems at boot. Perhaps this is why it is off by default on s390x. I also found some stuff online hinting that it is off on Readhat also. Perhaps someone from SUSE can comment as to why.
-----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Christian Paro Sent: Friday, April 20, 2012 5:06 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: Kernel ring buffer date stams missing Of course, if you don't need the time stamps for early boot, you can turn them on at runtime through the /sys filesystem: http://elinux.org/Debugging_by_printing#Printk_Timestamps On Fri, Apr 20, 2012 at 4:57 PM, Christian Paro <christian.p...@gmail.com>wrote: > Just a guess here, but maybe the s390x kernel for SLES 11 SP1 was compiled > with CONFIG_PRINTK_TIME disabled, while the x86-64 kernel had the same > option enabled? > > I do see those time-offset numbers at the beginning of output from other > kernels on s390x, so I don't think it's a difference inherent to the > architecture. > > > On Fri, Apr 20, 2012 at 4:40 PM, Aria Bamdad <a...@bsc.gwu.edu> wrote: > >> Hi, >> >> >> >> Anyone knows why the kernel ring buffer (dmesg) is missing the usual time >> stamp prefix on each line on System z? For example: >> >> >> >> SUSE SLES 11 SP1 on system z shows this: >> >> >> >> Write protected kernel read-only data: 0x100000 - 0x5fffff >> >> >> >> While Intel (same OS) shows: >> >> >> >> [ 1.611026] Write protecting the kernel read-only data: 8192k >> >> >> >> Thanks, >> >> Aria >> >> >> ---------------------------------------------------------------------- >> For LINUX-390 subscribe / signoff / archive access instructions, >> send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or >> visit >> http://www.marist.edu/htbin/wlvindex?LINUX-390 >> ---------------------------------------------------------------------- >> For more information on Linux on System z, visit >> http://wiki.linuxvm.org/ >> > > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
