Re: Ktimer / -rt9 (+custom) monotonic_clock going backwards.

[Steven Rostedt]

On Thu, 20 Oct 2005, Ingo Molnar wrote:
>
> * Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
>
> > > I just switched cycle_t to u64 and hackbench no longer makes the time go
> > > backwards.
> > >
> > > John, would this cause any problems to keep cycle_t at s64?
> >
> > I mean at u64.
>
> ugh. There's both cycles_t and cycle_t. We should unify the two and it
> should be 64-bit. The faster systems get, the sooner the 32-bit counter
> overflows. 64-bit systems are keeping 32-bit compatibility for quite
> some time to come. So with an 8GHz CPU the 32-bit cycle_t would wrap in
> like 500 msecs, way too fast to rely on ... (even with a 4GHz CPUs it's
> only one second.)
>
> i've made cycle_t u64 and have uploaded -rt14.
>

Ingo,

I'm disappointed in you, I expected you to upload 2.6.14-rc5-rt1

;-)

-- Steve

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/