On Tue, 2009-06-30 at 12:36 -0700, Eric W. Biederman wrote: > Dropped irqs.. Driver hangs because it is waiting for an irq. Hardware > hangs because it is waiting for the cpu to process the irq. > > Potentially we get a level triggered irq that is never acked by > the cpu that won't arm until the cpu send an ack, and we can't > send an ack from another cpu. Eric, Among number of experiments you have tried in the past to fix this, have you tried the experiment of explicitly clearing the remoteIRR by changing the trigger mode to edge and then back to level. Is there a problem with this? We can send a spurious IPI (after the RTE migration) with the new vector to another cpu and handler which services the level interrupt will check if we saw the edge mode for a level interrupt and then the handler can explicitly restore the level trigger and reset the remote IRR by mask +edge and unmask+level. We might have to work with some rough edges but do you recollect any major issue with this approach.. thanks, suresh -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
