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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 12:57:19 +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 12:38, Avi Kivity wrote:
> On 01/19/2012 07:39 PM, Jan Kiszka wrote:
>> On 2012-01-19 18:28, Marcelo Tosatti wrote:
>>> On Thu, Jan 19, 2012 at 01:46:39PM +0100, Jan Kiszka wrote:
>>>> Hi again,
>>>>
>>>> do we need some KVM knob comparable to qemu-kvm's -kvm-shadow-memory in
>>>> upstream?
>>>>
>>>> If yes: The underlying IOCTL is x86-only. Are other archs interested in
>>>> this long-term as well, ie. should the control become arch-independent?
>>>>
>>>> Jan
>>>
>>> Last time i asked about removal, Avi wished for it to remain.
>>>
>>
>> Then I guess he should comment on this after returning to work. :)
>
> -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? Would a machine option
"kvm_shadow_memory=n" be desirable?
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 <=
- 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, 2012/01/25
- Re: [Qemu-devel] qemu-kvm upstreaming: Do we want -kvm-shadow-memory semantics?, Avi Kivity, 2012/01/25