Re: [PATCH] Parallelize mtrr init between cpus

[H. Peter Anvin]

On 08/07/2012 07:08 PM, zhenzhong.duan wrote:
>   2012-08-08 00:32, H. Peter Anvin wrote:
> > On 08/07/2012 12:29 AM, zhenzhong.duan wrote:
> > > Current code serialize mtrr init with set_atomicity_lock.
> > > Mtrr init is quite slow when we bootup on a hvm with large mem, vcpus
> > > and pci passthroughed devices(eg. 24 vcpus + 90G mem).
> > > It took about ~30 mins to bootup, after patch, it took ~2 min.
> > When you're saying "HVM" do you mean "Xen HVM"?  How does it behave on
> > native hardware?
> >
> >     -hpa
> Yes, I mean Xen HVM. Bootup at same speed as before on baremetal.

Then I would like to know why Xen HVM takes so infernally long.  It 
isn't a good idea to make gratuitous changes in the main kernel to work 
around defects in Xen.

	-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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