Has anyone gotten tickless Linux to work under Parallels?
I have not - under Parallels Desktop for Mac build 3214, I've compiled a tickless kernel, but according to powertop it still is waking up by timer every HZ seconds, and I don't see the magic message displayed:
Code:
printk(KERN_INFO "Switched to NOHz mode on CPU #%d\n",
smp_processor_id());
It looks like Parallels only supports a few time sources:
Code:
$ sudo cat /sys/devices/system/clocksource/*/available_clocksource
pit jiffies tsc
not any of the "apic", "hpet", "i8253", and "vmiclock" support CLOCK_EVT_FEAT_ONESHOT, which is needed for tickless operation. Specifically, Local APIC support is disabled in the BIOS, and when I try to enable it by passing in the suggested "lapic" option, it said it was unable to do so.
Anyone gotten any of these other time sources to work?