[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] cpuidle and un-eoid interrupts at the local apic
On 04/09/2013 20:56, Thimo E. wrote: > Hello Andrew, > > thanks for your response. At least I've seen the trigger of the new > crash (2e) already before, so they seem so belong together. > > I can't image that I am the only one on the world who is using a > haswell board. And as I haven't seen any other Xen bug/crash reports > like mine (and one time you) nor bug reports from users with other > operating systems, I ask myself if only my hardware is buggy > or if other operating systems handle those "spurious" interrupts in > another way ?!?! > > What does " ioapic_ack=old" change ? > > Best regards > Thimo ioapic_ack=old is already in effect - see "Enabled directed EOI with ioapic_ack_old on!" in the boot dmesg. Originally, it was a bugfix workaround for ancient IO-APIC hardware which had a bug on one of the mask bits. Nowadays, it is used with EOI broadcast suppression, which is a APIC transaction performance improvement on recent processors. What it does is affect whether an IO-APIC interrupt gets masked when an interrupt is received. You could certainly try "ioapic_ack=new" and see whether that makes a difference, given a lack of any other ideas. It will disable EOI broadcast suppression. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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