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Hi Ben, Le Mittwoch 05 Oktober 2005 00:14, Benjamin Herrenschmidt a écrit : > The problem is indeed in via_calibrate_decr(). This routine works on > HZ/100 so it will not do any good with HZ not beeing a multiple of 100. > > Can you test this patch ? I can confirm that this patch solves the timer skew on my mac. Thanks! > > Index: linux-work/arch/ppc/platforms/pmac_time.c > =================================================================== > --- linux-work.orig/arch/ppc/platforms/pmac_time.c 2005-09-22 > 14:06:18.000000000 +1000 +++ > linux-work/arch/ppc/platforms/pmac_time.c 2005-10-05 08:14:17.000000000 > +1000 @@ -195,7 +195,7 @@ > ; > dend = get_dec(); > > - tb_ticks_per_jiffy = (dstart - dend) / (6 * (HZ/100)); > + tb_ticks_per_jiffy = (dstart - dend) / ((6 * HZ)/100); > tb_to_us = mulhwu_scale_factor(dstart - dend, 60000); > > printk(KERN_INFO "via_calibrate_decr: ticks per jiffy = %u (%u ticks)\n", > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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