From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: "Marek Behún" <kabel@kernel.org>,
linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org,
linuxarm@huawei.com, mauro.chehab@huawei.com,
gregkh@linuxfoundation.org
Subject: Re: [PATCH v2 16/17] leds: leds-nuc: add support for changing the ethernet type indicator
Date: Fri, 28 May 2021 13:33:47 +0200 [thread overview]
Message-ID: <20210528133347.46634db7@coco.lan> (raw)
In-Reply-To: <20210526145112.GB2141@amd>
Em Wed, 26 May 2021 16:51:12 +0200
Pavel Machek <pavel@ucw.cz> escreveu:
> 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.
I can't see how. I mean, the problem is to monitor the impact of the
BIOS call with may affect not only the application using the LED, but
all other applications running at the same time on different CPUs,
as the BIOS may want/need to lock other CPUs while its code is running, as
it can't see the Linux CPU locks.
Thanks,
Mauro
next prev parent reply other threads:[~2021-05-28 11:33 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-18 15:08 [PATCH v2 00/17] Adding support for controlling the leds found on Intel NUC Mauro Carvalho Chehab
2021-05-18 15:08 ` [PATCH v2 01/17] docs: describe the API used to set NUC LEDs Mauro Carvalho Chehab
2021-05-18 15:08 ` [PATCH v2 02/17] leds: add support for NUC WMI LEDs Mauro Carvalho Chehab
2021-05-18 15:08 ` [PATCH v2 03/17] leds: leds-nuc: detect WMI API detection Mauro Carvalho Chehab
2021-05-18 15:08 ` [PATCH v2 04/17] leds: leds-nuc: add support for changing S0 brightness Mauro Carvalho Chehab
2021-05-18 15:08 ` [PATCH v2 05/17] leds: leds-nuc: add all types of brightness Mauro Carvalho Chehab
2021-05-18 15:08 ` [PATCH v2 06/17] leds: leds-nuc: allow changing the LED colors Mauro Carvalho Chehab
2021-05-18 15:08 ` [PATCH v2 07/17] leds: leds-nuc: add support for WMI API version 1.0 Mauro Carvalho Chehab
2021-05-18 15:08 ` [PATCH v2 08/17] leds: leds-nuc: add basic support for NUC6 WMI Mauro Carvalho Chehab
2021-05-18 15:08 ` [PATCH v2 09/17] leds: leds-nuc: add brightness and color for NUC6 API Mauro Carvalho Chehab
2021-05-18 15:08 ` [PATCH v2 10/17] leds: leds-nuc: Add support to blink behavior for NUC8/10 Mauro Carvalho Chehab
2021-05-19 7:58 ` Marek Behun
2021-05-19 10:09 ` Mauro Carvalho Chehab
2021-05-18 15:09 ` [PATCH v2 11/17] leds: leds-nuc: get rid of an unused variable Mauro Carvalho Chehab
2021-05-18 15:09 ` [PATCH v2 12/17] leds: leds-nuc: implement blink control for NUC6 Mauro Carvalho Chehab
2021-05-18 15:09 ` [PATCH v2 13/17] leds: leds-nuc: better detect NUC6/NUC7 devices Mauro Carvalho Chehab
2021-05-18 15:09 ` [PATCH v2 14/17] leds: leds-nuc: add support for HDD activity default Mauro Carvalho Chehab
2021-05-18 15:09 ` [PATCH v2 15/17] leds: leds-nuc: fix software blink behavior logic Mauro Carvalho Chehab
2021-05-18 15:09 ` [PATCH v2 16/17] leds: leds-nuc: add support for changing the ethernet type indicator Mauro Carvalho Chehab
2021-05-19 8:02 ` Marek Behún
2021-05-19 10:18 ` Mauro Carvalho Chehab
2021-05-19 12:11 ` Marek Behún
2021-05-19 14:24 ` Mauro Carvalho Chehab
2021-05-19 15:55 ` Marek Behún
2021-05-19 18:30 ` Mauro Carvalho Chehab
2021-05-20 11:00 ` Marek Behún
2021-05-20 16:00 ` Mauro Carvalho Chehab
2021-05-20 16:36 ` Marek Behún
2021-05-20 18:59 ` Mauro Carvalho Chehab
2021-05-20 20:07 ` Marek Behún
2021-05-21 9:14 ` Mauro Carvalho Chehab
2021-05-26 14:51 ` Pavel Machek
2021-05-28 11:33 ` Mauro Carvalho Chehab [this message]
2021-05-26 14:47 ` Pavel Machek
2021-05-28 11:24 ` Mauro Carvalho Chehab
2021-05-18 15:09 ` [PATCH v2 17/17] leds: leds-nuc: add support for changing the power limit scheme Mauro Carvalho Chehab
2021-05-19 11:11 ` [PATCH v2 00/17] Adding support for controlling the leds found on Intel NUC Pavel Machek
2021-05-19 12:15 ` Mauro Carvalho Chehab
2021-05-19 19:41 ` Pavel Machek
2021-05-19 23:07 ` Mauro Carvalho Chehab
2021-05-20 16:19 ` Marek Behún
2021-05-20 19:16 ` Mauro Carvalho Chehab
2021-05-20 19:43 ` Marek Behún
2021-05-21 9:57 ` Mauro Carvalho Chehab
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