Red Hat Bugzilla – Bug 126815
fam kills system performance
Last modified: 2007-11-30 17:10:45 EST
Description of problem: Prior to an FC1-->FC2 upgrade, system
performance was very good specifically using PostgreSQL with very
large tables (1.5M+ records). Subseqent to the FC1-->FC2 upgrade there
was a dramatic drop in performance.
Version-Release number of selected component (if applicable): xinetd
How reproducible: Always
Steps to Reproduce:
1. Upgrade from FC1-->FC2
2. Create a large directory with 12,000 png files (by using find to
find all pngs on the system and symbolically linking to them).
3. Use nautilus to browse that directory while the links are being created
4. Run Top and watch fam eat up tons of CPU.
1. Upgrade from FC1-->FC2.
2. Run a PostgreSQL query on a very large table 1.5M+ records.
3. Compare time to FC1 execution.
4. Note the massive drop in performance.
The workaround is to disable fam. Once disabled, performance shoots
back up. I don't know if fam was enabled in FC1 but I'm not going back
to check now that I've finally stabilized FC2.
*** This bug has been marked as a duplicate of 124361 ***
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.