From: Andrew Rodland <arodland@entermail.net>
To: linux-kernel@vger.kernel.org
Subject: Re: voluntary-preempt T3 latency spikes with fan speed change
Date: Mon, 11 Oct 2004 13:03:01 -0400 [thread overview]
Message-ID: <ckeec5$id4$1@sea.gmane.org> (raw)
In-Reply-To: 20041009104702.GA14649@mobilat.informatik.uni-bremen.de
torbenh@gmx.de wrote:
>
> hi...
>
> i am seeing latency spikes (ie jack xruns) when the fan of my
> asus l3d laptop changes speed.
>
> is there any chance to fix this ?
> i have turned off acpi in the kernel, as this gives me latency spikes
> all over.
>
> i am quite new to the VP patches, and want to help where i can.
>
> i also got a quite strange latency trace here:
>
> could someone sched some light on this please ?
>
I can't say for certain, but I'm guessing that your laptop has a deeply
broken BIOS that implements ACPI and suchlike by using SMM, which blocks
out interrupts, and there's nothing, I believe, you can do about it.
Disabling ACPI seems sensible; at least you can avoid causing these delays
intentionally, but if some sensor interrupt triggers a flip into SMM to
enable the fan, you're just screwed for a number of milliseconds.
Andrew
next prev parent reply other threads:[~2004-10-11 17:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-09 10:47 voluntary-preempt T3 latency spikes with fan speed change torbenh
2004-10-11 17:03 ` Andrew Rodland [this message]
2004-10-11 21:56 ` Lee Revell
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