Red Hat Bugzilla – Bug 450014
Processes stuck in D state
Last modified: 2012-06-20 12:19:29 EDT
Description of problem:
We are seeing poor performance and note processes spending too much time in
It seems to be coupled to having a large number of files/dirs as we have an
apache cache with 2,000,000 entries and the problem is apparent. Before the
cache has any entries things are more responsive.
Version-Release number of selected component (if applicable):
2.6.9-67.0.15.ELhugemem #1 SMP Tue Apr 22 14:01:33 EDT 2008 i686 i686 i386 GNU/Linux
1. create an ext3 filesystem, create 64 directories each with 64 directories and
each again with 64 directories, total 64^3 directories
2. create some files in all those
3. then run find . -type f
4. then run ps -eo pid,stat,wchan:40,comm |grep D
PID STAT WCHAN COMMAND
21878 D+ wait_on_buffer find
Not that above.
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