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

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Fri, 17 Feb 2017, Julien Grall wrote:
> 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

Not in this case, I have four A53s on this platform.

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel