On Wed, Jan 06, 2010 at 05:48:52PM +0800, Sheng Yang wrote:
> Hi Beth
>
> I still found the emulated HPET would result in some boot failure. For
> example, on my 2.6.30, with HPET enabled, the kernel would fail
> check_timer(),
> especially in timer_irq_works().
>
> The testing of timer_irq_works() is let 10 ticks pass(using mdelay()), and
> want to confirm the clock source with at least 5 ticks advanced in jiffies.
> I've checked that, on my machine, it would mostly get only 4 ticks when HPET
> enabled, then fail the test. On the other hand, if I using PIT, it would get
> more than 10 ticks(maybe understandable if some complementary ticks there).
> Of
> course, extend the ticks count/mdelay() time can work.
>
> I think it's a major issue of HPET. And it maybe just due to a too long
> userspace path for interrupt injection... If it's true, I think it's not easy
> to deal with it.
>
PIT tick are reinjected automatically, HPET should probably do the same
although it may just create another set of problems.
--
Gleb.
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
