On Fri, Jan 22, 2010 at 04:47:13PM +0000, Jamie Lokier wrote: > Any tips on how to make the serial receive irq latency more reliable > on ARM, with a boringly generic serial driver? What you could do is arrange for a backtrace to be printed when you read an overrun condition from the UART - if interrupts were disabled by something taking a long time, and then enabled, you should see the point where they were just enabled in the backtrace. It could be down to another IRQF_DISABLED interrupt - in which case you won't see it in the backtrace. Of course, printing a backtrace will cause subsequent overruns... -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
