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xen-devel
Re: [Xen-devel] Xen 3.4.0 - Windows 2008 Lockup
On 24/05/2009 21:16, "Teck Choon Giam" <giamteckchoon@xxxxxxxxx> wrote:
>> Oh, by the way it would be interesting to see if your Windows slowness is
>> affected by putting hap=0 in the domain config file. Are you running with
>> recent Intel processors which support EPT, or with AMD processors supporting
>> NPT? The former can be checked via xm dmesg and look for EPT in the output.
>> If not then hap=0 will actually have no effect.
>
> Ok found the problem... ... vcpus set to above what is available will
> cause lockup for HVM windows vista/2008 (maybe others also) and even
> crash your dom0 (happened once and need a hard reboot)! I forgot
> about it as my servers mostly have 4 VCPUS :p This will not happen if
> running xen <3.4.0.
>
> Thanks a lot for all of you who replied especially to Keir who hint me
> related to processors type ;) My stupid overlook on VCPUS value can
> cause me headache... ...
You mean you set number of vcpus greater than number of cpus in your system?
That will indeed make the guest run slow, but shouldn't lock up dom0!
-- Keir
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