Re: No 100 HZ timer !

schwidefsky
2001-04-10T12:57:02Z

>Does not sound very attractive all at all on non virtual machines (I see
the point on
>UML/VM):
>making system entry/context switch/interrupts slower, making add_timer
slower, just to
>process a few less timer interrupts. That's like robbing the fast paths
for a slow path.
The system entry/exit/context switch is slower. The add_timer/mod_timer is
only
a little bit slower in the case a new soonest timer event has been created.
I
think you can forget the additional overhead for add_timer/mod_timer, its
the
additional path length on the system entry/exit that might be problematic.

blue skies,
Martin

Linux/390 Design & Development, IBM Deutschland Entwicklung GmbH
Schönaicherstr. 220, D-71032 Böblingen, Telefon: 49 - (0)7031 - 16-2247
E-Mail: schwidefsky@de.ibm.com