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Re: [Xen-devel] Real-time support
| To: | "Ky Srinivasan" <ksrinivasan@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Real-time support |
| From: | "Geoffrey Lefebvre" <geoffrey@xxxxxxxxx> |
| Date: | Tue, 8 May 2007 13:39:24 -0700 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 08 May 2007 13:37:47 -0700 |
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Hi, I did some basic measurements on worst case execution time inside the hypervisor a while ago (6-8 months ago). From what i remember, the worst case where between 1-2msec on a 3GHz P4. This was under some load (make -j64 bzImage). A big culprit was the mmu-ext hypercall which in certain cases recursively unpins a page table. Handling certain page faults also took a while. This was just a preliminary study so i didn't push the analysis very far. cheers, geoffrey On 5/8/07, Ky Srinivasan <ksrinivasan@xxxxxxxxxx> wrote: Since execution sequence within the hypervisor is non-preemptable, is there an upper bound on time that can be spent in the hypervisor? Thanks, K. Y _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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