* Are there any tools to calculate the cost of a VM exit
@ 2011-06-07 6:33 veerasena reddy
2011-06-07 7:04 ` Keir Fraser
0 siblings, 1 reply; 2+ messages in thread
From: veerasena reddy @ 2011-06-07 6:33 UTC (permalink / raw)
To: xen-devel
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Hi,
I am looking to add a new hypercall to XEN-3.4.3 and invoke this new
hypercall very often (may be 50 to 500 thousands of times a sec) from a HVM
guest.
I would like to see the cost of this to tradeoff with performance.
Could you please advice if there are tools for this or any other method that
i can use?
Thanks in advance.
Regards,
VSR.
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* Re: Are there any tools to calculate the cost of a VM exit
2011-06-07 6:33 Are there any tools to calculate the cost of a VM exit veerasena reddy
@ 2011-06-07 7:04 ` Keir Fraser
0 siblings, 0 replies; 2+ messages in thread
From: Keir Fraser @ 2011-06-07 7:04 UTC (permalink / raw)
To: veerasena reddy, xen-devel
On 07/06/2011 07:33, "veerasena reddy" <veeruyours@gmail.com> wrote:
> Hi,
>
> I am looking to add a new hypercall to XEN-3.4.3 and invoke this new hypercall
> very often (may be 50 to 500 thousands of times a sec) from a HVM guest.
> I would like to see the cost of this to tradeoff with performance.
>
> Could you please advice if there are tools for this or any other method that i
> can use?
In the HVM guest:
gettimeofday() (or RDTSC, or any other handy timestamp)
<call hypercall in a tight loop 10,000,000 times>
gettimeofday() (or equiv, as above)
-- Keir
> Thanks in advance.
>
> Regards,
> VSR.
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
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2011-06-07 7:04 ` Keir Fraser
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