Re: [Xen-devel] kernel bootup slow issue on ovm3.1.1

["zhenzhong.duan" <zhenzhong.duan@xxxxxxxxxx>]

ä 2012-08-13 17:29, Jan Beulich åé:
> > > > On 13.08.12 at 09:58, "zhenzhong.duan"<zhenzhong.duan@xxxxxxxxxx>  wrote:
> > ä 2012-08-10 22:22, Jan Beulich åé:
> > > Going back to your original mail, I wonder however why this
> > > gets done at all. You said it got there via
> > >
> > > mtrr_aps_init()
> > >    \->   set_mtrr()
> > >        \->   mtrr_work_handler()
> > >
> > > yet this isn't done unconditionally - see the comment before
> > > checking mtrr_aps_delayed_init. Can you find out where the
> > > obviously necessary call(s) to set_mtrr_aps_delayed_init()
> > > come(s) from?
> > At bootup stage, set_mtrr_aps_delayed_init is called by
> > native_smp_prepare_cpus.
> > mtrr_aps_delayed_init is always set to ture for intel processor in upstream
> > code.
> Indeed, and that (in one form or another) has been done
> virtually forever in Linux. I wonder why the problem wasn't
> noticed (or looked into, if it was noticed) so far.
>
> As it's going to be rather difficult to convince the Linux folks
> to change their code (plus this wouldn't help with existing
> kernels anyway), we'll need to find a way to improve this in
> the hypervisor.
Hi Jan, Tim
Is this issue improvable from xen side?
thanks
zduan

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