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<p>The situation is the following: Filesystem anonymous pages are
consuming all the available memory and only 100 MB is left to the
system. <br>
</p>
<p>The network driver, which allocates memory objects for Jumbo
frames, needs more than 100 MB to run correctly. If a burst of
networks packets arrive together, the available memory is fully
consumed and the new packets start to be dropped.</p>
<p>This situation wouldn't happen if the "useless" pages of the
filesystem were released just after the truncate operation.</p>
<p>What is the point of keeping truncated pages in memory ? Is that
a choice made by the kernel developers or there is something wrong
in the filesystem implementation ?<br>
</p>
<br>
<div class="moz-cite-prefix">On 16-07-06 12:29 PM, Mulyadi Santosa
wrote:<br>
</div>
<blockquote
cite="mid:CAGdaada_qt7iX7f3qea7QN5n9Om9jbsfNhgEfDpZHvnDSEzD7g@mail.gmail.com"
type="cite">
<div dir="ltr">Hi
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">Trying to help here:</div>
<div class="gmail_extra">You said you wanna do atomic
allocation. But then you said you want to allocate around ~100
MB contiguous memory region.</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">IIRC, if you want to do atomic
allocation, usually it can not be that big. I am not sure how
large, but surely not reaching 100 MB. For that size, I think
you should rely on vmalloc.</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">But, for clarification, maybe you
should also post your full content of /proc/buddyinfo and
/proc/meminfo </div>
<div class="gmail_extra"><br clear="all">
<br>
-- <br>
</div>
<div class="gmail_signature" data-smartmail="gmail_signature">regards,<br>
<br>
Mulyadi Santosa<br>
Freelance Linux trainer and consultant<br>
<br>
blog: <a moz-do-not-send="true"
href="http://the-hydra.blogspot.com" target="_blank">the-hydra.blogspot.com</a><br>
training: <a moz-do-not-send="true"
href="http://mulyaditraining.blogspot.com" target="_blank">mulyaditraining.blogspot.com</a></div>
<div class="gmail_extra">
</div>
</div>
<br>
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</blockquote>
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