Re: [Xen-devel] Xen on ARM IRQ latency and scheduler overhead

[Julien Grall <julien.grall@xxxxxxx>]

Hi Dario,

On 02/17/2017 06:40 PM, Dario Faggioli wrote:
> On Thu, 2017-02-09 at 16:54 -0800, Stefano Stabellini wrote:
> Actually, TSC on this box should be stable and invariant, so I guess I
> can try with the default governor. Will do that on Monday. Does ARM
> have frequency scaling (I did remember something on xen-devel, but I am
> not sure whether it landed upstream)?
I guess you mean the series sent by globallogic ([1])? If so, it was 
never upstreamed.
However the frequency scaling may depend on the processor used and 
sometimes implemented using big.LITTLE (e.g the task has to switch).
I am not sure why it would matter in this case.

[1] 
https://lists.xenproject.org/archives/html/xen-devel/2014-10/msg00801.html
--
Julien Grall

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