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Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory sem
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics? |
Date: |
Wed, 25 Jan 2012 13:10:38 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2012-01-25 13:04, Avi Kivity wrote:
> On 01/25/2012 01:57 PM, Jan Kiszka wrote:
>>>
>>> -kvm-shadow-memory is becoming less meaningful for ordinary workloads
>>> since everything uses TDP these days. It's still meaningful for testing
>>> (forcing aggressive cache replacement), or perhaps nested virtualization.
>>
>> So, is it used for testing in fact?
>
> It is not, but it should be. There's an extra_params option in
> autotest, I'll start using it to stress the mmu some more, even though
> it's going to slow things down for me.
OK.
>
>> Would a machine option
>> "kvm_shadow_memory=n" be desirable?
>
> Not sure, this is a host option, not a guest option. Machine options
> should be guest-visible.
machine options are not guest visible. Basically, this options falls
into the same category as kernel_irqchip.
Do we have alternatives? A top-level command line options is surely none.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
- [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?, Jan Kiszka, 2012/01/19
- Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?, Alexander Graf, 2012/01/19
- Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?, Marcelo Tosatti, 2012/01/19
- Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?, Jan Kiszka, 2012/01/19
- Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?, Avi Kivity, 2012/01/25
- Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?, Jan Kiszka, 2012/01/25
- Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?, Avi Kivity, 2012/01/25
- Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?,
Jan Kiszka <=
- Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?, Avi Kivity, 2012/01/25
- Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?, Jan Kiszka, 2012/01/25
- Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?, Avi Kivity, 2012/01/25