[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Time stopped
> On Fri, 2005-10-14 at 16:48 +0200, Stephan Böni wrote: > > Just for your information. I have the same problem on my installation. > > > Thanks for the feedback. I was wondering if I was the only one seeing > it. So managed to reproduce (once!) and now perhaps one step further to solving it - basically the guest is /not/ to blame; Xen itself is not updating time correctly. In my instance it was out (i.e. time was running slower) by a factor of approximately 16 -- 20. I'm trying to reproduce again to get more details - but it'd be helpful if folks could apply the below and, if they repro the problem: (1) get serial console to Xen (i.e. hit 'Ctrl-A' three times) (2) hit 'a' to dump the ac_timer queues and the scale info, (3) post the results to the list cheers, S. diff -r bd3268de4145 xen/arch/x86/time.c --- a/xen/arch/x86/time.c Fri Oct 14 14:40:48 2005 +++ b/xen/arch/x86/time.c Fri Oct 14 17:44:46 2005 @@ -133,6 +133,15 @@ return product; } +void print_scale(int cpu) +{ + struct cpu_time *t = &cpu_time[cpu]; + struct time_scale *s = &t->tsc_scale; + + printk("CPU%d: scale->mul_frac = %x\n", cpu, s->mul_frac); + printk("CPU%d: scale->shift = %d\n", cpu, s->shift); +} + void timer_interrupt(int irq, void *dev_id, struct cpu_user_regs *regs) { if ( timer_ack ) diff -r bd3268de4145 xen/common/ac_timer.c --- a/xen/common/ac_timer.c Fri Oct 14 14:40:48 2005 +++ b/xen/common/ac_timer.c Fri Oct 14 17:44:46 2005 @@ -225,6 +225,7 @@ spin_unlock_irq(&ac_timers[cpu].lock); } +extern void print_scale(int cpu); static void dump_timerq(unsigned char key) { @@ -239,6 +240,7 @@ for_each_online_cpu( i ) { printk("CPU[%02d] ", i); + print_scale( i ); spin_lock_irqsave(&ac_timers[i].lock, flags); for ( j = 1; j <= GET_HEAP_SIZE(ac_timers[i].heap); j++ ) { _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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