[Mageia-dev] Fwd: Re: [Cooker] System can stall under heavy IOs with slow storage devices
Frank Griffin
ftg at roadrunner.com
Tue Dec 20 01:48:03 CET 2011
Florian reads both lists, so I'm pretty sure this would have been
mentioned somewhere in Mageia-land, but I want to add that I have
experienced extreme delays in firefox and other apps when I run largely
IO-intensive apps with large file buffersizes, and the workaround in
this comment fixes this completely. We should consider this for our
kernels if we haven't already.
-------- Original Message --------
Subject: Re: [Cooker] System can stall under heavy IOs with slow
storage devices
Date: Mon, 19 Dec 2011 19:36:02 +0100
From: Florian Hubold <doktor5000 at arcor.de>
Reply-To: cooker at mandrivalinux.org
To: cooker at mandrivalinux.org
Am 19.12.2011 10:26, schrieb Franck Bui:
> Hello,
>
> I've noticed a regression on my system which can stall some applications
> (most notably firefox) during very very long time (> 10 mins).
Man, you're my hero, trying to find out what causes this since some months now.
At least two thumbs up! :)
> It's apparently related to transparent huge pages and I found that it
> had already been described by LWN here a month ago:
> http://lwn.net/Articles/467328/.
>
> Unlike what it's stated in the article, the regression is not really
> hard to trigger in my case: just plug a USB stick, copy on it a big
> file, then try to use firefox...
>
> To fix this, simply try to disable THP:
>
> echo madvise>/sys/kernel/mm//transparent_hugepage/enabled
>
> and firefox should work as expected now.
>
> So, if no one objects, the plan is to simply default the THP stuff to
> "madvise" for desktop flavour where an application has to ask
> explicitly huge page otherwise it will be disabled.
>
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