netdev - Re: [PATCH mlx5-next 1/2] net/mlx5: Add temperature warning event to log

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Date:   Wed, 30 May 2018 17:31:37 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "andrew@...n.ch" <andrew@...n.ch>
CC:     Jason Gunthorpe <jgg@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Ilan Tayari <ilant@...lanox.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Leon Romanovsky <leonro@...lanox.com>,
        Adi Nissim <adin@...lanox.com>
Subject: Re: [PATCH mlx5-next 1/2] net/mlx5: Add temperature warning event to
 log

On Wed, 2018-05-30 at 18:17 +0200, Andrew Lunn wrote:
> > Hi Andrew, yes the temperature is available by other means, this
> > patch
> > is needed for alert information reasons in order to know which
> > internal
> > sensors triggered the alarm.
> > We are working in parallel to expose temperature sensor to hwmon,
> > but
> > this is still WIP.
> > 
> > 
> > Is it ok to have both ?
> 
> Hi Saeed
> 
> Ideally no. hwmon has mechanisms for setting alarm thresholds, and
> indicating the thresholds have been exceeded. There are also ways to
> tie this to thermal zones, so the system can react on overheating,
> slow down the CPU, drop voltages, ramp up fans, etc. hwmon should be
> your primary interface, not dmesg.
> 

Yes we are working on this, but it is not something that can happen
soon since we need to define the correct Firmware APIs which are still
WIP.

> But if you are stuck doing things in the wrong order, i guess it is
> O.K. I don't think dmesg is a Binary API, so you can remove it later.
> 

Yes this is the plan, once the hwmon is supported we will remove the
extra dmesg warnings.

>      Andrew