linux-kernel - Re: [PATCH 00/13] KVM: MMU: fast page fault

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Date:	Thu, 12 Apr 2012 07:26:12 +0900
From:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Xiao Guangrong <xiaoguangrong.eric@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 00/13] KVM: MMU: fast page fault

On Wed, 11 Apr 2012 17:21:30 +0300
Avi Kivity <avi@...hat.com> wrote:

> Currently the main performance bottleneck for migration is qemu, which
> is single threaded and generally inefficient.  However I am sure that
> once the qemu bottlenecks will be removed we'll encounter kvm problems,
> particularly with wide (many vcpus) and large (lots of memory) guests. 
> So it's a good idea to improve in this area.  I agree we'll need to
> measure each change, perhaps with a test program until qemu catches up.

I agree.

I am especially interested in XBRLE + current srcu-less.

> > I am testing the current live migration to see when and for what it can
> > be used.  I really want to see it become stable and usable for real
> > services.

> Well, it's used in production now.

About RHEL6 e.g., yes of course and we are ...

My comment was about the current srcu-less and whether I can make it enough
stable in this rc-cycle.  I think it will enlarge real use cases in some
extent.

> > So I really do not want to see drastic change now without any real need
> > or feedback from real users -- this is my point.

> It's a good point, we should avoid change for its own sake.

Yes, especially because live migration users are limited to those who have
such services.

I hope that kernel developers start using it in their desktops!!!???

Thanks,
	Takuya
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