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<TITLE> [Mageia-dev] Fwd: Re: [Cooker] System can stall under heavy IOs with slow storage devices
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<H1>[Mageia-dev] Fwd: Re: [Cooker] System can stall under heavy IOs with slow storage devices</H1>
<B>Frank Griffin</B>
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TITLE="[Mageia-dev] Fwd: Re: [Cooker] System can stall under heavy IOs with slow storage devices">ftg at roadrunner.com
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<I>Tue Dec 20 13:26:19 CET 2011</I>
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<PRE>I've been noticing this symptom for a while now especially when running
programs that copy large files using large buffer sizes. It's worse
than just firefox, as the entire desktop will freeze for minutes at a time.
This change/workaround cleared this up entirely for me. If we haven't
incorporated this yet, we should consider doing so.
-------- 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 <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">doktor5000 at arcor.de</A>>
Reply-To: <A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">cooker at mandrivalinux.org</A>
To: <A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">cooker at mandrivalinux.org</A>
Am 19.12.2011 10:26, schrieb Franck Bui:
><i> Hello,
</I>><i>
</I>><i> I've noticed a regression on my system which can stall some applications
</I>><i> (most notably firefox) during very very long time (> 10 mins).
</I>Man, you're my hero, trying to find out what causes this since some months now.
At least two thumbs up! :)
><i> It's apparently related to transparent huge pages and I found that it
</I>><i> had already been described by LWN here a month ago:
</I>><i> <A HREF="http://lwn.net/Articles/467328/.">http://lwn.net/Articles/467328/.</A>
</I>><i>
</I>><i> Unlike what it's stated in the article, the regression is not really
</I>><i> hard to trigger in my case: just plug a USB stick, copy on it a big
</I>><i> file, then try to use firefox...
</I>><i>
</I>><i> To fix this, simply try to disable THP:
</I>><i>
</I>><i> echo madvise>/sys/kernel/mm//transparent_hugepage/enabled
</I>><i>
</I>><i> and firefox should work as expected now.
</I>><i>
</I>><i> So, if no one objects, the plan is to simply default the THP stuff to
</I>><i> "madvise" for desktop flavour where an application has to ask
</I>><i> explicitly huge page otherwise it will be disabled.
</I>><i>
</I>
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