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xen-devel
[Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL
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To: |
Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>, "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL |
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From: |
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Date: |
Mon, 27 Jul 2009 23:39:46 +0100 |
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Cc: |
"Dong, Eddie" <eddie.dong@xxxxxxxxx>, John Levon <levon@xxxxxxxxxxxxxxxxx> |
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Mon, 27 Jul 2009 15:40:18 -0700 |
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TSC scaling and softtsc reprise, and PROPOSAL |
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On 27/07/2009 23:14, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:
>> Yes, then it sounds like they virtualise it for apps too.
>> Also there is an
>> option to virtualise the TSC at a specified frequency -- that would be
>> pretty weird if it applied only to guest-OS RDTSCs but not
>> guest-app RDTSCs.
>>
>> Interesting...
>
> And further, the frequency is "sticky" across migration, with
> the frequency set to whatever machine the VM originated on.
>
> I'd be inclined to just use Xen system time and thus
> the TSC frequency would be always 1GHz on all systems.
Well that is what softtsc does already, albeit only for HVM guests so far.
-- Keir
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- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, (continued)
- [Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL, Keir Fraser
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Dan Magenheimer
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Dan Magenheimer
- [Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL, Keir Fraser
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Dan Magenheimer
- [Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL, Keir Fraser
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Dan Magenheimer
- [Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL,
Keir Fraser <=
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Zhang, Xiantao
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Dan Magenheimer
- [Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL, Keir Fraser
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Dan Magenheimer
- [Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL, Keir Fraser
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Dan Magenheimer
- [Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL, Keir Fraser
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Dan Magenheimer
- [Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL, Keir Fraser
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Zhang, Xiantao
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