[Mageia-dev] Fwd: Re: [Cooker] System can stall under heavy IOs with slow storage devices

Wed Dec 28 17:24:10 CET 2011

Am 20.12.2011 01:48, schrieb Frank Griffin:
+> 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.
+Check https://bugs.mageia.org/show_bug.cgi?id=3825#c0
+Update candidate currently going through validation ... ;)
+Also posted in the forums:
+https://forums.mageia.org/en/viewtopic.php?p=11691#p11691
+>
+> -------- 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.
+> >
+>
+>
+
+
+