HT on or off for E5-26xx ?

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I'm bringing up a new type of server using Intel E5-2620 (unisocket) which was selected for good SpecIntRate performance vs cost/power (201 for $410 and 95W).

Was assuming it was 6-core but I just noticed it has HT which is currently enabled since I see 12 cores in /proc/cpuinfo

Question for the performance experts : is it better to have HT enabled or disabled for this generation of Xeon ? Workload will be moderately concurrent, small OLTP type transactions. We'll also run a few low-load VMs (using KVM) and a big Java application.

Any thoughts welcome.
Thanks.








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