xen-devel
Re: [Xen-devel] write_tsc in a PV domain?
On 31/08/2009 19:11, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:
> I have yet to get a measurement of either syscall that
> is better than 2.5x WORSE than emulating rdtsc. On
> my dual-core Conroe (Intel E6850) with 64-bit Xen and
> 32-bit dom0, I get approximately:
>
> rdtsc native: 22ns
> softtsc (rdtsc emulated): 360ns
Trap-and-emulate in 360ns seems astoundingly good. Perhaps too good to be
true?
-- Keir
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
<Prev in Thread] |
Current Thread |
[Next in Thread>
|
- Re: [Xen-devel] write_tsc in a PV domain?, (continued)
- Re: [Xen-devel] write_tsc in a PV domain?, Alan Cox
- RE: [Xen-devel] write_tsc in a PV domain?, Dan Magenheimer
- [Xen-devel] rdtsc: correctness vs performance on Xen (and KVM?), Dan Magenheimer
- [Xen-devel] RE: rdtsc: correctness vs performance on Xen (and KVM?), Dan Magenheimer
- [Xen-devel] Re: rdtsc: correctness vs performance on Xen (and KVM?), Jeremy Fitzhardinge
- Re: [Xen-devel] write_tsc in a PV domain?, Jeremy Fitzhardinge
- RE: [Xen-devel] write_tsc in a PV domain?, Dan Magenheimer
- Re: [Xen-devel] write_tsc in a PV domain?, Jeremy Fitzhardinge
- RE: [Xen-devel] write_tsc in a PV domain?, Dan Magenheimer
- RE: [Xen-devel] write_tsc in a PV domain?, Dan Magenheimer
- Re: [Xen-devel] write_tsc in a PV domain?,
Keir Fraser <=
- RE: [Xen-devel] write_tsc in a PV domain?, Dan Magenheimer
- Re: [Xen-devel] write_tsc in a PV domain?, Jeremy Fitzhardinge
|
|
|