hyperthreadin low performance

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hi everyone,

Recently update a database to machine with RHEL7, but i see that the performance is betther if the hyperthreading tecnology is deactivated and use only 32 cores.

is normal that the machine performance is better with 32 cores that 64 cores?.

BD: postgresql 9.3.5
Machine: Dell PE R820
processor:  4x Intel(R) Xeon(R) CPU E5-4620 v2 @ 2.60GHz eigth-core
RAM: 128GB
Storage SSD SAN

thanks by your help

--
Atentamente,


JEISON BEDOYA DELGADO
ADM.Servidores y comunicaciones
AUDIFARMA S.A.



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