On Tue, Oct 22, 2013 at 10:36 AM, Chris Turner <[email protected] > wrote:
> > Hello - > > Trying to run a 64bit DF guest on F18, am getting > some odd clock jitter both with and without dntpd > running from the guest, and needless to say, 'make' > doesn't like this. > What's the output of sysctl kern.cputimer There are several cputimers. You could disable them through tunables (/boot/loader.conf): hw.tsc_cputimer_enable="0" (disable TSC cputimer, enabled by default) debug.acpi.disabled="hpet timer" (disable HPET and ACPI cputimer, enabled by default) If they are all enabled (default) and are all functional, their priority relationship is TSC > HPET > ACPI If they are all disabled, the only one left is i8254. Best Regards, sephe > I seem to recall having similar issues with DF-on-DF > QEMU on dragonfly, and my 'fix' was to noodle with > the emulated time source on QEMU, falling back to a low > resolution clock source (e.g. RTC instead of HPET) > that the emulator could more deterministically provide, > allowing clock calibration to be less sensitive, > and the system to run without much significant clock > jitter.. > > However, I'm not seeing any clear signs that > the libvirt/KVM stuff allows this level of noodling, > though I admittedly haven't done an exhaustive search. > > Anyone have any experiences / fixes here? > > Cheers, > > - Chris > -- Tomorrow Will Never Die
