Hi, from time to time Linux fails to boot in my kvm boxes, complaining like this:
[...] PAT WC disabled due to known CPU erratum. CPU: L1 I cache: 32K, L1 D cache: 32K CPU: L2 cache: 2048K CPU 0/0 -> Node 0 ACPI: Core revision 20080609 Parsing all Control Methods: Table [DSDT](id 0001) - 295 Objects with 45 Devices 104 Methods 6 Regions tbxface-0596 [00] tb_load_namespace : ACPI Tables successfully acquired evxfevnt-0091 [00] enable : Transition to ACPI mode successful ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 ..MP-BIOS bug: 8254 timer not connected to IO-APIC ...trying to set up timer (IRQ0) through the 8259A ... ..... (found apic 0 pin 0) ... ....... failed. timer doesn't work through the IO-APIC - disabling NMI Watchdog! ...trying to set up timer as Virtual Wire IRQ... ..... failed. ...trying to set up timer as ExtINT IRQ... ..... failed :(. Kernel panic - not syncing: IO-APIC + timer doesn't work! Boot with apic=debug and send a report. Then try booting with the 'noapic' option. The problem seems to be that timer_irq_works() fails, ie. less than 4 out of 10 PIC ticks made it to the guest within that test window. Gleb, is this something your anti-drift patches for the PIC would address as well? Jan
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