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 uninterruptible sleep. 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 How reproducible: 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 Actual results: PID STAT WCHAN COMMAND 21878 D+ wait_on_buffer find Expected results: Not that above.
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