On Fri, 10 Apr 2009, jvrao wrote: > Qlogic driver uses MSI-EDGE interrupts by default. > > On -rt kernel under heavy IO load we observed that the driver missed > interrupts occasionally. > > Missing interrupts caused spurious mailbox timeouts and path failovers. > > Suspecting MSI interrupts, we disabled MSI and forcing the driver to use > APIC interrupts (Patch attached). > > With this change, our IO tests ran for extended period of time without > any issues. > > It would be interesting to see if the MSI infrastructure itself has > issues on realtime, or it is the combination of qla2xxx/MSI. > > Right now we don't have any setup to test out MSI with other adapters. > Hence, wondering if anyone faced similar issues. Could you perhaps provide some details on hardware used within your testing -- HBA type, storage, etc? Also, can you share any logs of the failures with extended-error-logging enabled (ql2xextended_error_logging)? Regards, Andrew Vasquez -- 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
