kernel version impact on PostgreSQL performance

[Cyril Scetbon <cscetbon.ext@xxxxxxxxxxxxxxxxxx>]

Does anyone know what can be the differences between linux kernels 
2.6.29 and 2.6.30 that can cause this big difference (TPS x 7 !)
http://www.phoronix.com/scan.php?page=article&item=linux_2624_2633&num=2

Regards
--
Cyril SCETBON

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