Ubuntu
linux package

  1. Bug #1159258
  2. Comment #3

Comment 3 for bug 1159258

Revision history for this message
Jon Skanes (jon-skanes) wrote : Re: The IOSCHED default of deadline combined with 4k page size causes poor performance in lightly configured systems.

The idea that led me to try transparent_hugepage came from another piece of evidence I forgot to mention. I noticed that half of my RAM, 1GB, was consumed by anonymous page allocations. Transparent_hugepage, through khugepaged, defragments AND merges the 4k anonymous pages into hugepages. I figured that it would be far better to have a few hundred 2MB pages to reduce the overhead of context switches. It seems the savings of 60MB in reduced page tables, and its seemingly miraculous return to the living, is all the evidence needed. My system is now chugging along with roughly 400MB of hugepages, at any given time.