Andrew Vasquez wrote: > 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)? Hi, the following link provides more information on the logs and our analysis. https://bugzilla.redhat.com/show_bug.cgi?id=466903 [root@elm3c29 R2-SR1]# lspci | grep -i qlogic 03:05.0 Fibre Channel: QLogic Corp. ISP2422-based 4Gb Fibre Channel to PCI-X HBA (rev 02) 03:05.1 Fibre Channel: QLogic Corp. ISP2422-based 4Gb Fibre Channel to PCI-X HBA (rev 02) Storage is DS4700 (Product ID: 1814) If you need more information, please let me know, I can generate more information/logs. I will also find time to reproduce this with ql2xextended_error_logging enabled. Thanks, JV > > 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 -- 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
