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kernel console timestamps behaving oddly on 2.6.26-1-ip4xx (on an NSLU2)?



Hey folks--

what are the numbers at the start of the kernel console logs supposed
to represent?

I have always assumed they were timestamps, but now that i'm seeing
odd behavior in them on my NSLU2 running 2.6.26-1-ixp4xx from sid, i
don't know what they're supposed to mean.  Here's the example from a
recent reboot.

Why would the number jump from 0 to 42949372.96?  I can't help but
notice that this is exactly 2^32 - 30000 jiffies, if a jiffy is
1/100th of a second.  It looks like some internal unsigned jiffy
counter is overflowing somehow, or being rolled backward by 30000
jiffies.  What does this mean?  It seems to me like this is going to
cause an internal counter overflow 300 seconds after boot.  This does
not happen on an x86 system i've got running 2.6.26-1-686.

0 igor:~# head -n20 /var/log/kern.log
Aug 26 16:21:25 igor kernel: Kernel logging (proc) stopped.
Aug 26 16:21:25 igor kernel: Kernel log daemon terminating.
Aug 26 16:23:09 igor kernel: klogd 1.5.0#5, log source = /proc/kmsg started.
Aug 26 16:23:09 igor kernel: [    0.000000] Initializing cgroup subsys cpu
Aug 26 16:23:09 igor kernel: [    0.000000] Linux version 2.6.26-1-ixp4xx (Debian 2.6.26-3) (waldi@debian.org) (gcc version 4.1.3 20080623 (prerelease) (Debian 4.1.2-23)) #1 Thu Aug 21 09:59:59 UTC 2008
Aug 26 16:23:09 igor kernel: [    0.000000] CPU: XScale-IXP42x Family [690541f1] revision 1 (ARMv5TE), cr=0000397f
Aug 26 16:23:09 igor kernel: [    0.000000] Machine: Linksys NSLU2
Aug 26 16:23:09 igor kernel: [    0.000000] Memory policy: ECC disabled, Data cache writeback
Aug 26 16:23:09 igor kernel: [    0.000000] On node 0 totalpages: 8192
Aug 26 16:23:09 igor kernel: [    0.000000]   DMA zone: 64 pages used for memmap
Aug 26 16:23:09 igor kernel: [    0.000000]   DMA zone: 0 pages reserved
Aug 26 16:23:09 igor kernel: [    0.000000]   DMA zone: 8128 pages, LIFO batch:0
Aug 26 16:23:09 igor kernel: [    0.000000]   Normal zone: 0 pages used for memmap
Aug 26 16:23:09 igor kernel: [    0.000000]   Movable zone: 0 pages used for memmap
Aug 26 16:23:09 igor kernel: [    0.000000] CPU0: D VIVT undefined 5 cache
Aug 26 16:23:09 igor kernel: [    0.000000] CPU0: I cache: 32768 bytes, associativity 32, 32 byte lines, 32 sets
Aug 26 16:23:09 igor kernel: [    0.000000] CPU0: D cache: 32768 bytes, associativity 32, 32 byte lines, 32 sets
Aug 26 16:23:09 igor kernel: [42949372.960000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 8128
Aug 26 16:23:09 igor kernel: [42949372.960000] Kernel command line: console=ttyS0,115200 rtc-x1205.probe=0,0x6f noirqdebug
Aug 26 16:23:09 igor kernel: [42949372.960000] Unknown boot option `rtc-x1205.probe=0,0x6f': ignoring

Thanks for any insight,

       --dkg

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