include/asm-ia64/param.h defines HZ to be 1024 for usermode use, i.e.,
when the file gets installed as /usr/include/asm/param.h.
As the comment says:
Technically, this is wrong, but some old apps still refer to it.
The proper way to get the HZ value is via sysconf(_SC_CLK_TCK).
At the very least, this technically wrong #define ought to reflect the
current default value (250) used by all arch/ia64 platforms. No one uses
1024 anymore. This makes those "old apps" (e.g., usr/bin/iostat) behave
properly for with a default kernel. (And at some point, the define ought
to be removed altogether, which would expose all the applications that
erroneously expect HZ to be a compile-time constant.)
Signed-off-by: John Hawkes <hawkes@xxxxxxx>
Index: linux/include/asm-ia64/param.h
===================================================================
--- linux.orig/include/asm-ia64/param.h 2006-06-17 18:49:35.000000000 -0700
+++ linux/include/asm-ia64/param.h 2006-06-27 14:46:53.119407077 -0700
@@ -36,7 +36,7 @@
* Technically, this is wrong, but some old apps still refer to it. The proper way to
* get the HZ value is via sysconf(_SC_CLK_TCK).
*/
-# define HZ 1024
+# define HZ 250
#endif
#endif /* _ASM_IA64_PARAM_H */
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