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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Aug 30, 2012 at 10:03:12AM +0100, Tim Deegan wrote:
> At 13:36 +0800 on 29 Aug (1346247391), zhenzhong.duan wrote:
> > 
> > 
> > ??? 2012-08-13 17:29, Jan Beulich ??????:
> > >>>>On 13.08.12 at 09:58, "zhenzhong.duan"<zhenzhong.duan@xxxxxxxxxx>  
> > >>>>wrote:
> > >>??? 2012-08-10 22:22, Jan Beulich ??????:
> > >>>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?
> 
> Probably; we're looking into the best way to address it. 
> 
> Tim.

Ping? Was there any progress on this? Thanks

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