Memory fragmentation in a Linux settop box


 
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# 22  
Old 09-18-2014
Quote:
Originally Posted by achenle
In your case, I suspect the C++ core is probably mmap() anonymous memory, requesting large pages, and using them for video processing buffers. And, unfortunately, then releasing them, allowing the page cache to fragment the large pages. Eventually you get to the point where there are no large pages available because of fragmentation.
Would turning off hugepages somehow be a solution? It could be just one bit in a binary's code segment somewhere... There'd be a performance hit from using small pages but less than the hit of not getting the memory you need at all...
# 23  
Old 09-19-2014
Quote:
Originally Posted by achenle
Do you know where the source code for those portions can be found?
It's in the git repository at https://github.com/openatv/enigma2/tree/master/lib/ , however "dvbdmx_write" showing up in the log file in post #1 seems to be just part of Linux, I have found an old version at https://github.com/opennetworklinux/...re/dvb_demux.c , today openATV 4.2 is using Linux kernel 3.14.2 on the box showing the problems (Gigablue Quad).

I apologize for not having mentioned this before: On that machine the problems started when changing from openATV verison 4.1 to 4.2, and one change was updating the kernel from 3.3.8 to 3.14.2.
# 24  
Old 09-22-2014
According to https://bbs.archlinux.org/viewtopic.php?id=184655
you can try to increase vm.min_free_kbytes
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