Fedora SMP and 12 core cpu's

[JD]

On 10/02/2010 11:09 AM, Gilboa Davara wrote:
> On Thu, 2010-09-30 at 10:26 -0700, JD wrote:
>
>> Granularity applies to the locking scheme in the kernel.
>> It is how the kernel must prevent different cors/cpus from
>> clobberig the same kernel global data at the same time.
>>
>> Some locking schemes are coarser than others. There is
>> an optimal point where further granularity will decrease
>> performance.
>>
>> I was looking for papers/studies that may have been done
>> to see at what degree of granularity the payoff was highest.
> Most of the 2.6 kernel no longer uses the BKL (AKA Big kernel lock) and
> uses fine grained locking instead, making some code paths better suited
> when it comes to operating in heavily-SMP'ed environments (10's of
> core). (E.g. IP vs IPX)
>
> As you are talking about recent hardware (AMD Opteron 6xxx I presume)
> with (only) 12 cores, I doubt that you'll hit any major performance
> barrier.
>
> As I said in a previous comment, some additional information on what you
> want to do with the machine will be helpful.
>
I just wanted to read the papers/studies, if they exist somewhere.