linux-kernel - Re: Improve timer Resolution on imx28

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Message-Id: <201212211552.17744.marex@denx.de>
Date:	Fri, 21 Dec 2012 15:52:17 +0100
From:	Marek Vasut <marex@...x.de>
To:	Torben Hohn <torbenh@...utronix.de>
Cc:	Shawn Guo <shawn.guo@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Mike Turquette <mturquette@...aro.org>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: Re: Improve timer Resolution on imx28

Dear Torben Hohn,

> Hi,
> 
> this Series increases the timer frequency and decreases min_delta_ns.
> I saw pretty high max latencies with cyclictest: ~600us.
> 
> The cause was the min_delta_ns value of 0xf 32kHz clockcycles.
> But with the 32kHz Clock, the period is still around 30us.
> So we just increase the clock freqeuncy driving the timers
> here.

Thanks for the set. Just a really quick question -- won't this under no 
circumstance cause interrupt storm?

Best regards,
Marek Vasut
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