Mark Wong <mark...@gmail.com> wrote: 
> Has anyone experimented with the Linux deadline parameters and
> have some experiences to share?
 
We've always used elevator=deadline because of posts like this:
 
http://archives.postgresql.org/pgsql-performance/2008-04/msg00148.php
 
I haven't benchmarked it, but when one of our new machines seemed a
little sluggish, I found this hadn't been set.  Setting this and
rebooting Linux got us back to our normal level of performance.
 
-Kevin

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