Messages in this thread | | | Date | Wed, 20 Feb 2002 13:36:02 +0200 | From | Ville Herva <> | Subject | Re: jiffies rollover, uptime etc. |
| |
On Tue, Feb 19, 2002 at 12:55:22PM -0800, you [george anzinger] wrote: > > > > > Does this problem still exist on 64-bit machines? > > > > Absolutely. But not as often ;-) > > Actually you will have a VERY hard time getting it to roll over. Issues > of your life time, not to mention the hardware's life time. 64 bits > makes a VERY large number and you are counting in 427 day increments. > Remember we have been counting seconds since 1970 in 32 bits and > rollover is still, most likely, beyond the capability of any machine > running today to get to. Now consider counting in 427 day increments > instead of seconds.
48.5 day increments, not 497. On alpha and ia64 it's 1024 jiffies per second.
Well, ok. Majority of the 64-bit archs seem to in fact use HZ=100:
asm-alpha/param.h:# define HZ 1024 asm-ia64/param.h:# define HZ 1024 asm-mips64/param.h:#define HZ 100 asm-ppc64/param.h:#define HZ 100 asm-s390x/param.h:#define HZ 100 asm-sparc64/param.h:#define HZ 100 asm-x86_64/param.h:#define HZ 100
-- v --
v@iki.fi - 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/
| |