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From: Julien Grall <julien.grall@arm.com>
To: Dario Faggioli <dario.faggioli@citrix.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	xen-devel@lists.xen.org
Cc: george.dunlap@eu.citrix.com, edgar.iglesias@xilinx.com, nd@arm.com
Subject: Re: Xen on ARM IRQ latency and scheduler overhead
Date: Fri, 17 Feb 2017 19:44:41 +0000	[thread overview]
Message-ID: <69783c6d-1e65-3fa4-8b71-8c99d9e23eb6@arm.com> (raw)
In-Reply-To: <1487356845.6732.100.camel@citrix.com>

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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  reply	other threads:[~2017-02-17 19:44 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 [this message]
2017-02-17 22:55     ` Stefano Stabellini
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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