From: Stefano Stabellini <sstabellini@kernel.org>
To: Julien Grall <julien.grall@arm.com>
Cc: edgar.iglesias@xilinx.com,
Stefano Stabellini <sstabellini@kernel.org>,
george.dunlap@eu.citrix.com,
Dario Faggioli <dario.faggioli@citrix.com>,
xen-devel@lists.xen.org, nd@arm.com
Subject: Re: Xen on ARM IRQ latency and scheduler overhead
Date: Fri, 17 Feb 2017 14:55:04 -0800 (PST) [thread overview]
Message-ID: <alpine.DEB.2.10.1702171454450.9566@sstabellini-ThinkPad-X260> (raw)
In-Reply-To: <69783c6d-1e65-3fa4-8b71-8c99d9e23eb6@arm.com>
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.
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next prev parent reply other threads:[~2017-02-17 22:55 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-10 0:54 Xen on ARM IRQ latency and scheduler overhead Stefano Stabellini
2017-02-10 8:40 ` Dario Faggioli
2017-02-10 18:32 ` Stefano Stabellini
2017-02-16 12:20 ` Dario Faggioli
2017-02-16 19:52 ` Stefano Stabellini
2017-02-16 23:07 ` Stefano Stabellini
2017-02-17 11:02 ` Dario Faggioli
2017-02-17 19:34 ` Julien Grall
2017-02-17 23:14 ` Stefano Stabellini
2017-02-18 0:02 ` Stefano Stabellini
2017-02-18 0:47 ` Dario Faggioli
2017-02-17 18:40 ` Dario Faggioli
2017-02-17 19:44 ` Julien Grall
2017-02-17 22:55 ` Stefano Stabellini [this message]
2017-02-18 0:59 ` Dario Faggioli
2017-02-20 12:18 ` Punit Agrawal
2017-02-18 0:41 ` Stefano Stabellini
2017-02-20 11:04 ` George Dunlap
2017-02-20 11:40 ` Dario Faggioli
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