From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.xen@gmail.com>
Subject: Re: Are there any tools to calculate the cost of a VM exit
Date: Tue, 07 Jun 2011 08:04:43 +0100
Message-ID: <CA138C1B.1BAFC%keir.xen@gmail.com>
References: <BANLkTi=z8uDqLYGsE-oKVD181hGm6OALxw@mail.gmail.com>
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To: veerasena reddy <veeruyours@gmail.com>, xen-devel@lists.xensource.com
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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.
> 
> 
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