Re: Intel TurboBoost in practice

On Sep 20, 2010, at 8:41 AM, Ivan Voras wrote: [ ... ] > If I understand correctly, TurboBoost is supposed to increase the frequency > of one or a small number of cores only? > > What is the physical increase in frequency on this CPU when TurboBoost is > enabled? It depends on how many cores ar

Re: Intel TurboBoost in practice

Ivan Voras wrote: > On 09/19/10 06:57, Alexander Motin wrote: >> Getting back to that topic I would like to share some more results. This >> time I was testing Core(TM) i7 870 @ 2.93GHz. It has 8 logical cores and >> bigger allowed TurboBoost effect. I was testing real time of net/mpd5 >> port buil

Re: Intel TurboBoost in practice

On 09/19/10 06:57, Alexander Motin wrote: Getting back to that topic I would like to share some more results. This time I was testing Core(TM) i7 870 @ 2.93GHz. It has 8 logical cores and bigger allowed TurboBoost effect. I was testing real time of net/mpd5 port building, using single CPU. I was

Re: Intel TurboBoost in practice

Getting back to that topic I would like to share some more results. This time I was testing Core(TM) i7 870 @ 2.93GHz. It has 8 logical cores and bigger allowed TurboBoost effect. I was testing real time of net/mpd5 port building, using single CPU. I was testing it with HZ=1000 with different C-sta

Re: Intel TurboBoost in practice

Alan Cox wrote: > On Mon, Jul 26, 2010 at 9:11 AM, Alexander Motin > wrote: > > In that case using C2 or C3 predictably caused small performance reduce, > as after falling to sleep, CPU needs time to wakeup. Even if tested CPU0 > won't ever sleep during test,

Re: Intel TurboBoost in practice

On Mon, Jul 26, 2010 at 9:11 AM, Alexander Motin wrote: > Robert Watson wrote: > > On Sun, 25 Jul 2010, Alexander Motin wrote: > >>> The numbers that you are showing doesn't show much difference. Have > >>> you tried buildworld? > >> > >> If you mean relative difference -- as I have told, it's mo

Re: Intel TurboBoost in practice

Robert Watson wrote: > On Sun, 25 Jul 2010, Alexander Motin wrote: >>> The numbers that you are showing doesn't show much difference. Have >>> you tried buildworld? >> >> If you mean relative difference -- as I have told, it's mostly because >> of my CPU. It's maximal boost is 266MHz (8.3%), but 13

Re: Intel TurboBoost in practice

On Sun, 25 Jul 2010, Alexander Motin wrote: The numbers that you are showing doesn't show much difference. Have you tried buildworld? If you mean relative difference -- as I have told, it's mostly because of my CPU. It's maximal boost is 266MHz (8.3%), but 133MHz of them is enabled most of t

Re: Intel TurboBoost in practice

Rui Paulo wrote: > On 24 Jul 2010, at 14:53, Alexander Motin wrote: >> Here is my test case: FreeBSD 9-CURRENT on Core i5 650 CPU, 3.2GHz + 1/2 >> TurboBoost steps (+133/+266MHz) with boxed cooler at the open air. I was >> measuring building time of the net/mpd5 from sources, using only one CPU >>

Re: Intel TurboBoost in practice

Norikatsu Shigemura wrote: > On Sat, 24 Jul 2010 16:53:10 +0300 > Alexander Motin wrote: >> PS: In this case benefit is small, but it is the least that can be >> achieved, depending on CPU model. Some models allow frequency to be >> risen by up to 6 steps (+798MHz). > > I tested on Core i7

Re: Intel TurboBoost in practice

Hi mav. On Sat, 24 Jul 2010 16:53:10 +0300 Alexander Motin wrote: > PS: In this case benefit is small, but it is the least that can be > achieved, depending on CPU model. Some models allow frequency to be > risen by up to 6 steps (+798MHz). I tested on Core i7 640UM (Arrandale 1.2GHz ->

Re: Intel TurboBoost in practice

On Sat, Jul 24, 2010 at 9:18 AM, Rui Paulo wrote: > > On 24 Jul 2010, at 14:53, Alexander Motin wrote: > >> Hi. >> >> I've make small observations of Intel TurboBoost technology under >> FreeBSD. This technology allows Intel Core i5/i7 CPUs to rise frequency >> of some cores if other cores are idl

Re: Intel TurboBoost in practice

On 24 Jul 2010, at 14:53, Alexander Motin wrote: > Hi. > > I've make small observations of Intel TurboBoost technology under > FreeBSD. This technology allows Intel Core i5/i7 CPUs to rise frequency > of some cores if other cores are idle and power/thermal conditions > permit. CPU core counted a

Re: Intel TurboBoost in practice

2010/7/24 Alexander Motin > Hi. > > I've make small observations of Intel TurboBoost technology under > FreeBSD. This technology allows Intel Core i5/i7 CPUs to rise frequency > of some cores if other cores are idle and power/thermal conditions > permit. CPU core counted as idle, if it has been p

Intel TurboBoost in practice

Hi. I've make small observations of Intel TurboBoost technology under FreeBSD. This technology allows Intel Core i5/i7 CPUs to rise frequency of some cores if other cores are idle and power/thermal conditions permit. CPU core counted as idle, if it has been put into C3 or deeper power state (may r