> On 12/18/2009 11:56 AM, Vladimir Cotfas wrote: > > All, > > > > I have a a driver that must process an interrupt every 100 uS without > > missing any. I am having latency issues and I am looking for some help > > debugging my problem. > > You'll probably never get this working reliably with the RT kernel. > Latencies are more deterministic with the RT kernel but slightly higher. > You'll have better luck with a vanilla kernel running your app in run > level 4. And then even better luck running on an SMP machine isolating > your process and IRQ to a single processor. And stay away from the VGA > console. You have better luck with faster hardware too. We have seen <20us avg latencies on RT kernel on slower powerpc-based SoC. The only problem is that sometimes we got single-shot latency >150 us - that happened when sched tick was running for >100 us with interrupts disabled. -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
