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

[Florian Hubold]

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.
> >
>
>