linux-kernel - Re: [PATCH] Parallelize mtrr init between cpus

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Date:	Wed, 08 Aug 2012 10:08:49 +0800
From:	"zhenzhong.duan" <zhenzhong.duan@...cle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Feng Jin <joe.jin@...cle.com>
Subject: Re: [PATCH] Parallelize mtrr init between cpus



  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.
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