Re: time jumps forward/backwards

2009-09-03 Thread Ben Gamsa
Benjamin Gamsa wrote: Benjamin Herrenschmidt wrote: On Mon, 2009-08-31 at 23:57 -0400, Benjamin Gamsa wrote: Sean MacLennan wrote: On Mon, 31 Aug 2009 22:20:00 -0400 Benjamin Gamsa wrote: For what it's worth, the problem occurs even when ntp is not even started. This is grasping, but could

Re: time jumps forward/backwards

2009-09-01 Thread Benjamin Gamsa
Benjamin Herrenschmidt wrote: On Mon, 2009-08-31 at 23:57 -0400, Benjamin Gamsa wrote: Sean MacLennan wrote: On Mon, 31 Aug 2009 22:20:00 -0400 Benjamin Gamsa wrote: For what it's worth, the problem occurs even when ntp is not even started. This is grasping, but could it have anything to do

Re: time jumps forward/backwards

2009-09-01 Thread Benjamin Herrenschmidt
On Mon, 2009-08-31 at 23:57 -0400, Benjamin Gamsa wrote: > Sean MacLennan wrote: > > On Mon, 31 Aug 2009 22:20:00 -0400 > > Benjamin Gamsa wrote: > > > >> For what it's worth, the problem occurs even when ntp is not even > >> started. > > > > This is grasping, but could it have anything to do wi

Re: time jumps forward/backwards

2009-08-31 Thread Benjamin Gamsa
Sean MacLennan wrote: On Mon, 31 Aug 2009 22:20:00 -0400 Benjamin Gamsa wrote: For what it's worth, the problem occurs even when ntp is not even started. This is grasping, but could it have anything to do with the jiffies wrapping near startup? I don't know how to test it, but I don't thi

Re: time jumps forward/backwards

2009-08-31 Thread Sean MacLennan
On Mon, 31 Aug 2009 22:20:00 -0400 Benjamin Gamsa wrote: > For what it's worth, the problem occurs even when ntp is not even > started. This is grasping, but could it have anything to do with the jiffies wrapping near startup? Cheers, Sean ___ Linux

Re: time jumps forward/backwards

2009-08-31 Thread Benjamin Gamsa
Benjamin Gamsa wrote: Benjamin Gamsa wrote: Paul Mackerras wrote: Ben Gamsa writes: It appears to be the case that when the time on the system is around the epoch (1970), that time will occasionally jump forward and then backward by about 17592 seconds. When it jumps forward, it always jum

Re: time jumps forward/backwards

2009-08-31 Thread Benjamin Gamsa
Benjamin Gamsa wrote: Paul Mackerras wrote: Ben Gamsa writes: It appears to be the case that when the time on the system is around the epoch (1970), that time will occasionally jump forward and then backward by about 17592 seconds. When it jumps forward, it always jumps back a few milliseco

Re: time jumps forward/backwards

2009-08-31 Thread Benjamin Gamsa
Paul Mackerras wrote: Ben Gamsa writes: It appears to be the case that when the time on the system is around the epoch (1970), that time will occasionally jump forward and then backward by about 17592 seconds. When it jumps forward, it always jumps back a few milliseconds later. However, it

Re: time jumps forward/backwards

2009-08-31 Thread Paul Mackerras
Ben Gamsa writes: > It appears to be the case that when the time on the system is around the > epoch (1970), that time will occasionally jump forward and then backward > by about 17592 seconds. When it jumps forward, it always jumps back a > few milliseconds later. However, it's not always ea

time jumps forward/backwards

2009-08-31 Thread Ben Gamsa
Our project is currently using 2.6.27.4 with a patch from Paul Mackerras ("powerpc: Improve resolution of VDSO clock_gettime") running on a MPC8555. We picked up the patch on the hope that it would fix an earlier problem we had with time jumping forwards and backwards shortly after boot-up. I