Quation about HZ kernel option
Oliver Fromme
olli at lurza.secnetix.de
Thu Oct 4 07:33:28 PDT 2007
Artem Kuchin wrote:
> Oliver Fromme wrote:
> > Artem Kuchin wrote:
> > > What value of HZ option would you recommend
> > > for a hosting (web) server with a lot of processes
> > > (about 900) and polling off (as decided from previous
> > > discussion polling is useless in
> > > this situation).
> >
> > In that case, I would recommend not to override the
> > default at all (which is 1000).
>
> Umm.. default is 100 (one hundred), i think.
No, the default is 1000 for quite a few years. Well,
except on the alpha platform, but I guess you're on
either i386 or amd64, not alpha.
Quote from src/sys/kern/subr_param.c:
#ifndef HZ
# if defined(__amd64__) || defined(__i386__) || defined(__ia64__) || defined(__sparc64__)
# define HZ 1000
# else
# define HZ 100
# endif
#endif
Best regards
Oliver
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