Re: HyperThreading
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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
>
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<div dir=3D"ltr">Since I moved from FreeBSD I make assumptions, I thought i=
t is enabled by default which seems not to be case. I will build a custom k=
ernel then (or is there a better way !? ) But my question is, why UP is pro=
ffered over SMP ?! is there any specific reason !? Does DFBSD perform bette=
r in UP rather than SMP mode ?! I just read that UP is the default mode for=
ever (<a href=3D"http://www.shiningsilence.com/dbsdlog/2010/10/26/6670.html=
">http://www.shiningsilence.com/dbsdlog/2010/10/26/6670.html</a>), it is in=
teresting to know the reason though. <br>
<br>Thanks,<br>Saman<br><br><div class=3D"gmail_quote">On Thu, Feb 17, 2011=
at 1:12 PM, Jan Lentfer <span dir=3D"ltr"><<a href=3D"mailto:Jan.Lentfe=
r@web.de">Jan.Lentfer@web.de</a>></span> wrote:<br><blockquote class=3D"=
gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb=
(204, 204, 204); padding-left: 1ex;">
Saman Barghi schrieb:<div class=3D"im"><br>
<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; borde=
r-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
I wanted to know if DragonFlyBSD supports Hyper threading or not. I did som=
e benchmarking recently and it seems that on a Xeon dual core with 2 virtua=
l 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 do=
es not support Hyperthreading !? If that is the case, I need to perform the=
benchmarks on a different machine without hyper threading. Please kindly a=
dvise.<br>
</blockquote>
<br></div>
Simple question first: Did you install a SMP Kernel?<br><font color=3D"#888=
888">
<br>
Jan<br>
</font></blockquote></div><br></div>
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