# Re: \[PATCH 2.6.21-rt2\] PowerPC: decrementer clockevent driver

- From: Paul Mackerras \<hidden\>
- Date: 2007-07-10 23:55:09 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2007/07/977878
- Thread: https://ratatoskr.run/lkml/2007/05/957088/t.md

```text
Segher Boessenkool writes:

> > This scales with the number of processors since there is one
> > decrementer per core (is it per thread on SMT chips?
> > I don't know).
> 
> One per core.

No, each thread has its own decrementer, but the timebase is shared.

Paul.
```