Re: HyperThreading

[Saman Barghi <saman.b@xxxxxxxxx>]

Since I moved from FreeBSD I make assumptions, I thought it is enabled by default which seems not to be case. I will build a custom kernel then (or is there a better way !? ) But my question is, why UP is proffered over SMP ?! is there any specific reason !? Does DFBSD perform better in UP rather than SMP mode ?! I just read that UP is the default mode forever (http://www.shiningsilence.com/dbsdlog/2010/10/26/6670.html), it is interesting to know the reason though.

Thanks,
Saman

On Thu, Feb 17, 2011 at 1:12 PM, Jan Lentfer <Jan.Lentfer@web.de> wrote:

Saman Barghi schrieb:

I wanted to know if DragonFlyBSD supports Hyper threading or not. I did some benchmarking recently and it seems that on a Xeon dual core with 2 virtual cpu per core, DFBSD only scale to 2 threads and after that the number of transactions/second dorps (using sysbench oltp). So does that mean DFBSD does not support Hyperthreading !? If that is the case, I need to perform the benchmarks on a different machine without hyper threading. Please kindly advise.

Simple question first: Did you install a SMP Kernel?

Jan