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[Xen-devel] Re: rdtsc: correctness vs performance on Xen (and KVM?)
| To: | Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: rdtsc: correctness vs performance on Xen (and KVM?) |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 01 Sep 2009 15:34:07 +0100 |
| Cc: | "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 01 Sep 2009 07:35:55 -0700 |
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| Thread-topic: | rdtsc: correctness vs performance on Xen (and KVM?) |
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On 01/09/2009 14:54, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote: > >> Making vsyscall work... > > While I highly respect your opinion, and while vsyscall > may be a fine choice in the future, it just doesn't > solve the problem today and won't solve it ever for > currently shipping PV OS's. If you can figure out a > way to allow vsyscall to be installed as a module and > still achieve its performance, it > might be a possible solution, but otherwise we have > to go around the OS to solve this problem. Do you believe there's a solution which doesn't involve PV kernel modifications? I think the suggestions you've made so far would require such modifications. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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