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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.<br>
<br>
This change/workaround cleared this up entirely for me. If we
haven't incorporated this yet, we should consider doing so.<br>
<br>
-------- Original Message --------
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Subject: </th>
<td>Re: [Cooker] System can stall under heavy IOs with slow
storage devices</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Mon, 19 Dec 2011 19:36:02 +0100</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th>
<td>Florian Hubold <a class="moz-txt-link-rfc2396E" href="mailto:doktor5000@arcor.de"><doktor5000@arcor.de></a></td>
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<td><a class="moz-txt-link-abbreviated" href="mailto:cooker@mandrivalinux.org">cooker@mandrivalinux.org</a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">To: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:cooker@mandrivalinux.org">cooker@mandrivalinux.org</a></td>
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<pre>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:
> <a class="moz-txt-link-freetext" href="http://lwn.net/Articles/467328/">http://lwn.net/Articles/467328/</a>.
>
> 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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