linux-kernel - Re: [PATCH v2 2/3] hwmon: (asus_wmi_ec

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Message-ID: <CAB95QASpK+ajGTpJoMTQN1epa-QMy9sJHRPFVyizFgCa3dut=Q@mail.gmail.com>
Date:   Mon, 25 Oct 2021 15:10:48 +0200
From:   Eugene Shalygin <eugene.shalygin@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Denis Pauk <pauk.denis@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Jean Delvare <jdelvare@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-hwmon@...r.kernel.org
Subject: Re: [PATCH v2 2/3] hwmon: (asus_wmi_ec_sensors) Support B550 Asus WMI.

Hi All,

> On that machine a single reading of the EC register (i.e. a call to
> ec_read()) takes approx. 14 ms. The timeout is probably right here.

I migrated that ASUS machine to another distribution (Arch -> Gentoo,
kernel versions 5.14.8 -> 5.14.14) and surprisingly reading EC
registers became faster. I accumulated data from 14133 read operations
and the times are distributed as follows: 84 % at 4 ms, 10 % at 5 ms,
5.0 % at 6 ms and the rest is between 3 and 9 ms (but concentrating
around multiples of 0.5 ms).

In the meantime the only other user who provided EC read timeouts
showed 14 ms per EC read too.

Regards,
Eugene