Displaying 1 result from an estimated 1 matches for "io_apci_ack".
2012 Feb 17
0
IO-APIC line level race condition
...ine level interrupt race condition in
Xen-4.1. The result was that an outstanding un-eoi''d interrupt at the
IO-APIC resulted in the mptsas controller offlining the root filesystem.
This is now two separate IO-APIC bugs found recently.
1) Cisco C210 M2 server - EOI Broadcast Suppression, io_apci_ack=old
2) Dell R710 - No EOI Broadcast Suppression, io_apic_ack=new
Both servers use IO-APIC version 0x20 and have an mptsas controller for
their disks, using Legacy PCI line level interrupts. Workload on both
servers appear to have more active vcpus
Case 1 is now considered stable by the customer...