[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] Time goes backwards in dom0 in xen-unstable
>From: Dan Magenheimer >Sent: 2009年4月15日 3:37 > >I'm seeing some "Time went backwards" errors reported >in dom0 in near-tip (c/s 19515) xen-unstable build. >It's rare and random and not reproducible, but here's >the report that just showed up. There was no load >running at the time. > >I can move to 3.4-rc1 if that would be helpful but I >don't remember seeing any time-related changes recently. > >This was on my dual-core test machine which reports >lots of power management info during Xen boot. could you add "hpetbroadcast" in grub.conf? This is possibly caused by PIT broadcast again as in your Mcycles thread. http://markmail.org/thread/uzqcmjuu6uc5xxqd is one write-up about those side-effects when cpuidle gets enabled by default in Xen 3.4. Preferred way to do broadcast is always to use HPET, however by far one missing feature makes PIT as default broadcast on most platforms. That missing feature is to emulate RTC interrupt with IRQ8 replaced by HPET if using legacy replacement mode. We're adding that emulation now and hopefully get it ready in several days and in final Xen 3.4 release. At that time, PIT will be only turned to on some old platform (then no deep C-state support) or weird BIOS not exporting HPET (then simply disable cpuidle). Thanks Kevin > >Dan > >Timer ISR/0: Time went backwards: delta=-14971734 >delta_cpu=25028266 shadow=3655 >618577922 off=580668482 processed=3656214217729 >cpu_processed=3656174217729 > 0: 3656174217729 > 1: 3656214217729 >Timer ISR/0: Time went backwards: delta=-14971447 >delta_cpu=25028553 shadow=3655 >618577922 off=590668621 processed=3656224217729 >cpu_processed=3656184217729 > 0: 3656184217729 > 1: 3656224217729 >Timer ISR/0: Time went backwards: delta=-14970691 >delta_cpu=25029309 shadow=3655 >618577922 off=620669383 processed=3656254217729 >cpu_processed=3656214217729 > 0: 3656214217729 > 1: 3656254217729 >Timer ISR/0: Time went backwards: delta=-14970623 >delta_cpu=25029377 shadow=3655 >618577922 off=630669373 processed=3656264217729 >cpu_processed=3656224217729 > 0: 3656224217729 > 1: 3656254217729 >Timer ISR/0: Time went backwards: delta=-14969392 >delta_cpu=25030608 shadow=3655 >618577922 off=680670676 processed=3656314217729 >cpu_processed=3656274217729 > 0: 3656274217729 > 1: 3656304217729 >Timer ISR/0: Time went backwards: delta=-14967619 >delta_cpu=25032381 shadow=3655 >618577922 off=740672580 processed=3656374217729 >cpu_processed=3656334217729 > 0: 3656334217729 > 1: 3656374217729 >Timer ISR/0: Time went backwards: delta=-14967315 >delta_cpu=25032685 shadow=3655 >618577922 off=750672771 processed=3656384217729 >cpu_processed=3656344217729 > 0: 3656344217729 > 1: 3656374217729 > >_______________________________________________ >Xen-devel mailing list >Xen-devel@xxxxxxxxxxxxxxxxxxx >http://lists.xensource.com/xen-devel > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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