Re: do_gettimeofday monotony?
On Mon, Jul 25, 2005 at 11:12:25AM -0400, Christopher Friesen wrote: > >Is do_gettimeofday supposed to be monotonous? > > Nope. > > > I'm seeing time go backward by tiny amounts, and then progressing. > > Are you running NTP? Corrections could cause this. No. I am running a machine which often changes it clockspeed though. The bad news is that I don't appear to be able to reproduce this, there must be something specific that causes it. But then again, it wasn't a large effect. > >Is there another monotonous clock in the kernel that doesn't wrap (all > >that often)? Doesn't really need to be wall time. > > clock_gettime() Thank you. -- http://www.PowerDNS.com Open source, database driven DNS Software http://netherlabs.nl Open and Closed source services - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: do_gettimeofday monotony?
bert hubert wrote: Is do_gettimeofday supposed to be monotonous? Nope. > I'm seeing time go backward by tiny amounts, and then progressing. Are you running NTP? Corrections could cause this. Is there another monotonous clock in the kernel that doesn't wrap (all that often)? Doesn't really need to be wall time. clock_gettime() Chris - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: do_gettimeofday monotony?
bert hubert wrote: Is do_gettimeofday supposed to be monotonous? Nope. I'm seeing time go backward by tiny amounts, and then progressing. Are you running NTP? Corrections could cause this. Is there another monotonous clock in the kernel that doesn't wrap (all that often)? Doesn't really need to be wall time. clock_gettime() Chris - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: do_gettimeofday monotony?
On Mon, Jul 25, 2005 at 11:12:25AM -0400, Christopher Friesen wrote: Is do_gettimeofday supposed to be monotonous? Nope. I'm seeing time go backward by tiny amounts, and then progressing. Are you running NTP? Corrections could cause this. No. I am running a machine which often changes it clockspeed though. The bad news is that I don't appear to be able to reproduce this, there must be something specific that causes it. But then again, it wasn't a large effect. Is there another monotonous clock in the kernel that doesn't wrap (all that often)? Doesn't really need to be wall time. clock_gettime() Thank you. -- http://www.PowerDNS.com Open source, database driven DNS Software http://netherlabs.nl Open and Closed source services - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
do_gettimeofday monotony?
Is do_gettimeofday supposed to be monotonous? I'm seeing time go backward by tiny amounts, and then progressing. I'm using do_gettimeofday on a single processor, CONFIG_PREEMPT_NONE=y, and saving stuff from generic_make_request - see http://ds9a.nl/diskstat for the source. 2.6.13-rc3-mm1, HZ=250. I'll try to figure out how much it is going back, and it is some kind of magic interval. Is there another monotonous clock in the kernel that doesn't wrap (all that often)? Doesn't really need to be wall time. Thanks! -- http://www.PowerDNS.com Open source, database driven DNS Software http://netherlabs.nl Open and Closed source services - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
do_gettimeofday monotony?
Is do_gettimeofday supposed to be monotonous? I'm seeing time go backward by tiny amounts, and then progressing. I'm using do_gettimeofday on a single processor, CONFIG_PREEMPT_NONE=y, and saving stuff from generic_make_request - see http://ds9a.nl/diskstat for the source. 2.6.13-rc3-mm1, HZ=250. I'll try to figure out how much it is going back, and it is some kind of magic interval. Is there another monotonous clock in the kernel that doesn't wrap (all that often)? Doesn't really need to be wall time. Thanks! -- http://www.PowerDNS.com Open source, database driven DNS Software http://netherlabs.nl Open and Closed source services - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
