linux-kernel - Re: sluggish system responsiveness under higher IO load

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Date:	Fri, 15 Sep 2006 20:17:09 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Matthias Dahl <mlkernel@...tal-soul.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: sluggish system responsiveness under higher IO load

On Sun, Sep 03 2006, Matthias Dahl wrote:
> On Thursday 10 August 2006 14:28, Jens Axboe wrote:
> 
> >> > [...] It would be
> >> > nice if you could gather vmstat 1 info during a problematic period.
> >> > blktrace info could also be very useful:
> >>
> >> - Does disabling preemtion (CONFIG_PREEMPT_NONE=y) help?
> 
> >  http://www.mortal-soul.de/blktrace.log.bz2
> >  http://www.mortal-soul.de/vmstat.log.bz2
> 
> Jens, did you get these? Just wondered because it's been almost a month since. 
> BTW... just a few more observations:
> 
> 1. running an OpenGL app like ET and just having some compiling done in the
>    background or some light disk io gives distorted sound playback as well as
>    very poor OpenGL performance
> 
> 2. switching between console and xorg also results in short sound distortions
>    even though the cpu load is almost zero
> 
> Maybe those and the original problem are somehow related.

Sounds like a hardware issue, someone could be hogging the bus. You
could try and play with the pci latency setting.

-- 
Jens Axboe

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