Messages in this thread | | | Date | Thu, 20 Oct 2005 17:55:25 +0200 | From | Ingo Molnar <> | Subject | Re: Ktimer / -rt9 (+custom) monotonic_clock going backwards. |
| |
* Steven Rostedt <rostedt@goodmis.org> 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |