linux-kernel - Re: BIOS THRM-Throttling and driver timings

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]

Message-ID: <20f65d530610081504o3a72f654pf60cb9e0278bf2e0@mail.gmail.com>
Date:	Mon, 9 Oct 2006 11:04:18 +1300
From:	"Keith Chew" <keith.chew@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: BIOS THRM-Throttling and driver timings

Hi

> > in general linux should be ok with this happening. However for specific
> > cases... you'll need to provide more information; you're not
> > mentioning
>
> Really? AFAICT P4 will happily slow down behind our backs, making at
> least udelays() with interrupts disabled sleep for too long.
>

I believe we are seeing similar behaviours with the drivers. As a
temporary workaround, we have asked the manufacturers to supply us
with a BIOS that disabled THRM-Throttling. So far, things are looking
good, but we are still doing more testing.

> > (also: if you actually HIT throttling, there is something very very
> > wrong; you're not supposed to hit that unless the fan is defective, but
> > never in "normal" healthy operation. If you do hit it without hardware
> > defects then there is most likely a fundamental airflow problem you'll
> > want to fix urgently)
>
> At least in toshiba notebook, I was hitting thermal throttling even
> through both fans were okay. There are many misdesigned machines out
> there, I fear.

In our case, we are running the unit in mobile environment, with not
much ventilation. In our test environment, the unit runs fine at
temperatures of 80-90 degrees. In the real environment, we only expect
temperatures of 50-70 degrees.

Regards
Keith
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/