Messages in this thread | | | Date | Wed, 25 Jul 2007 09:25:09 +0200 | From | "Henri Hunnekens" <> | Subject | TSC calibration sometimes not correct with RT patch. |
| |
I've seen that the calbration of the TSC timer was not always done correctly, which resulted in incorrect timers.
I found out that local_irq_disable is used before the calibration is started. However with the RT patch applied this does not mean that the interrupts are disabled and therefore the calibration may fails when it's interrupted by an interrupt. Correct me if I'm wrong.
I think that this local_irq_disable must be replaced with the raw_local_irq_disable which does disable the interrupts.
I'm not able to verify if this solves the problem because it is very hard to reproduce. Maybe someone can verify if my assumption is correcly.
Currently I'm using kernel version 2.6.20-RT8, but I've checked that latest kernel version with the latest RT patch and they have the same implementation. - 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/
| |