Re: [PATCH] Better "Losing Ticks" Error Message

[Nikita Danilov]

timothy parkinson writes:
 > 
 > Andrew,
 > 
 > Seems like a lot of people see the below error message, but aren't quite sure
 > why it happens or how to fix it.  I sure didn't.
 > 
 > Here's my attempt at remedying that - Should apply cleanly against 2.6.1.
 > 
 > Thanks,
 > Timothy
 > 
 > diff -urN linux-2.6.1-orig/arch/i386/kernel/timers/timer_tsc.c linux-2.6.1/arch/i386/kernel/timers/timer_tsc.c
 > --- linux-2.6.1-orig/arch/i386/kernel/timers/timer_tsc.c	2004-01-09 01:59:46.000000000 -0500
 > +++ linux-2.6.1/arch/i386/kernel/timers/timer_tsc.c	2004-01-23 21:16:24.000000000 -0500
 > @@ -232,9 +232,13 @@
 >  		/* sanity check to ensure we're not always losing ticks */
 >  		if (lost_count++ > 100) {
 >  			printk(KERN_WARNING "Losing too many ticks!\n");
 > -			printk(KERN_WARNING "TSC cannot be used as a timesource."
 > -					" (Are you running with SpeedStep?)\n");
 > -			printk(KERN_WARNING "Falling back to a sane timesource.\n");
 > +			printk(KERN_WARNING "TSC cannot be used as a timesource.  ");
 > +			printk(KERN_WARNING "Possible reasons for this are:\n");
 > +			printk(KERN_WARNING "  You're running with Speedstep,\n");
 > +			printk(KERN_WARNING "  You don't have DMA enabled for your hard disk (see hdparm),\n");
 > +			printk(KERN_WARNING "  Incorrect TSC synchronization on an SMP system (see dmesg).\n");

+#ifdef CONFIG_KGDB
+			printk(KERN_WARNING "  You're single-stepping under kgdb (see what you are doing).\n");
+#endif

Modulo that person debugging kernel with kgdb probably understands this
anyway.

 > +			printk(KERN_WARNING "Falling back to a sane timesource now.\n");
 > +

Nikita.
-
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