if anything elevator=deadline seems to cause higher iowait and for
longer periods  (I even saw a 100% for it with that setting) when
running trackerd

average iowait values when tracker is flushing to disk during heavy
indexing of same files:

for feisty 2.6.20-15 : 90-95% 
for 2.6.22-9 : 90-99% 
for 2.6.22-9 with elevator=deadline: 95-100%

-- 
Heavy Disk I/O harms desktop responsiveness
https://bugs.launchpad.net/bugs/131094
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