linux-kernel - Re: [PATCH v2 16/17] leds: leds-nuc: add support for changing the ethernet type indicator

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Date:   Wed, 26 May 2021 16:51:12 +0200
From:   Pavel Machek <pavel@....cz>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Marek Behún <kabel@...nel.org>,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        linuxarm@...wei.com, mauro.chehab@...wei.com,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v2 16/17] leds: leds-nuc: add support for changing the
 ethernet type indicator

Hi!

> > You say that for this controller it would be bad to do in SW, because it
> > would take too much time in BIOS calls. (I wonder how much...) 
> 
> Yeah, it would be interesting to know how much. However, measuring BIOS
> latency and time spent on such calls can be tricky: one needs to use a
> high-res clock that it is not used anywhere else, in order to measure
> it. 

I'm sure you can time kernel compilation while LEDs are using software
netdev trigger, for example.

								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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