On Thu, 2009-03-12 at 07:51 +0100, Frans Pop wrote: > On Thursday 12 March 2009, John Stultz wrote: > > * Reverting both 6c9bacb41c10 and 5cd1c9c5cf30 against 2.6-git did not > > seem to help the issue, as originally reported. I also reverted > > 49b5cf34727a as well just in case, and it didn't help either. > > Hmm, interesting. I think you may have reproduced a similar failure case, > but not exactly the same as mine. I wonder if what you have reproduced is > the same as Debian bug report http://bugs.debian.org/511334. That is with > 2.6.26 which would match the fact that the reverts that work reliably for > me did not work for you. I've never had any problems with Debian's 2.6.26 > in my configuration. Hmmm. I have indeed seen issues w/ the 2.6.26 debian kernel, so that does seem closer to what I'm seeing. > For me 2.6.28.7 is rock solid with the two reverts. I've attached my > kernel config and my Hercules config. I think the critical thing in my > config may be the "TIMERINT 500" setting for Hercules, which is somewhat > similar to your "goes away if HZ is anything except 250" observation. I'll have to checkout that option. Does changing HZ value or disabling NO_HZ change anything for your situation as well? > > That's about all I can get for today. I'm out of town until Monday, so > > I'll start digging back into it then. > > From your other replies I've seen that I have been way off track at some > points. It looks as if I have been looking at events too early in the > boot and been confused by the use of clock->xtime_nsec. My apologies for > any confusion caused by that. > > I have a few more tests I think I can usefully do, but will try harder not > to confuse the issue with my inexpert ramblings anymore :-P No, no, this is subtle and optimized code that keeps very high precision values. Its not trivial stuff, so your confusion is understandable. thanks -john -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
