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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

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