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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: |
Thu, 23 Jul 2009 16:29:30 +0100 |
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Cc: |
"Dong, Eddie" <eddie.dong@xxxxxxxxx>, John Levon <levon@xxxxxxxxxxxxxxxxx> |
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Thu, 23 Jul 2009 08:30:08 -0700 |
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TSC scaling and softtsc reprise, and PROPOSAL |
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On 23/07/2009 16:18, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:
>> I've informally heard that certain version of the JVM and
>> Oracle Db have a habit of pounding rdtsc hard from user
>> space, but I don't know what rates.
>
> Indeed they do and they use it for timestamping
> events/transactions, so these are the very same
> apps that need to guarantee SMP timestamp ordering.
Why would you expect host TSC consistency running on Xen to be worse than
when running on a native OS?
-- Keir
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- [Xen-devel] 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, Zhang, Xiantao
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Dan Magenheimer
- [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL, Ian Pratt
- [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, 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
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