Re: [Xen-users] Xen 4.1.2 HT disaware (?)

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2013-04-25 at 02:59 +0100, Vadim A. Misbakh-Soloviov wrote:
> By the way, Ian. JFYI:
> I just rebooted machine and booted up Xen directly via EFI (previously
> it was booted via GRUB2, which booted via EFI).
> Now Xen see all 12 threads-cores.
> 
> So, as far, as I googled, it seems, it is kind of common bug, that Xen
> can't see some processor cores, when boots under GRUB2.

Thanks, I wasn't aware of this issue but now I know.

> //btw, I've another issue with dom0, which I can't fix up about a week:
> 
> > node1 ~ % hwclock -r
> > hwclock: select() to /dev/rtc to wait for clock tick timed out: Success
> > node1 ~ % hwclock -r --directisa
> > hwclock: select() to /dev/rtc to wait for clock tick timed out: Success
> 
> And even making thing like such:
> > node1 ~ % hwclock --utc --noadjfile --set --date="2013-04-25 05:56:00"
> don't fixes anything :(
> 
> Most strange that it happens only when kernel booted up as dom0, but do
> not, when baremetal.
> Hasn't Xen some ways to fix RTC emulation in hypervisor? :)

dom0 only sees PV wallclock time and not an RTC (emulated or real) since
the real RTC is owned by the hypervisor.

There is supposed to be some way to ask the hypervisor to set the RTC
time, but I'm afraid I don't recall how it fits together on a pvops
kernel. I know that on a classic Xen kernel if you ran ntpd (or
ntpdate?) it would get pushed down, but I don't think pvops kernels do
that.

Sorry, that's all I can remember.

Ian.



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