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<H1>[Mageia-dev] Fwd: Re: [Cooker] System can stall under heavy IOs with slow storage devices</H1>
<B>Florian Hubold</B>
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TITLE="[Mageia-dev] Fwd: Re: [Cooker] System can stall under heavy IOs with slow storage devices">doktor5000 at arcor.de
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<I>Wed Dec 28 17:24:10 CET 2011</I>
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<PRE>Am 20.12.2011 01:48, schrieb Frank Griffin:
><i> Florian reads both lists, so I'm pretty sure this would have been mentioned
</I>><i> somewhere in Mageia-land, but I want to add that I have experienced extreme
</I>><i> delays in firefox and other apps when I run largely IO-intensive apps with
</I>><i> large file buffersizes, and the workaround in this comment fixes this
</I>><i> completely. We should consider this for our kernels if we haven't already.
</I>Check <A HREF="https://bugs.mageia.org/show_bug.cgi?id=3825#c0">https://bugs.mageia.org/show_bug.cgi?id=3825#c0</A>
Update candidate currently going through validation ... ;)
Also posted in the forums:
<A HREF="https://forums.mageia.org/en/viewtopic.php?p=11691#p11691">https://forums.mageia.org/en/viewtopic.php?p=11691#p11691</A>
><i>
</I>><i> -------- Original Message --------
</I>><i> Subject: Re: [Cooker] System can stall under heavy IOs with slow storage
</I>><i> devices
</I>><i> Date: Mon, 19 Dec 2011 19:36:02 +0100
</I>><i> From: Florian Hubold <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">doktor5000 at arcor.de</A>>
</I>><i> Reply-To: <A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">cooker at mandrivalinux.org</A>
</I>><i> To: <A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">cooker at mandrivalinux.org</A>
</I>><i>
</I>><i>
</I>><i>
</I>><i> Am 19.12.2011 10:26, schrieb Franck Bui:
</I>><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>><i> Man, you're my hero, trying to find out what causes this since some months now.
</I>><i> At least two thumbs up! :)
</I>><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>><i>
</I>><i>
</I>
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