[CentOS] performance and interrupts

Mag Gam magawake at gmail.com
Fri Sep 24 14:42:48 EDT 2010


Thanks for the reply.

I am just playing around to understand this.


On Fri, Sep 24, 2010 at 9:43 AM, JohnS <jses27 at gmail.com> wrote:
>
> On Fri, 2010-09-24 at 08:57 -0400, Mag Gam wrote:
>> I am playing around with irqbalance to tune my 8 core system so I came
>> across this page,
>> http://kb.fusionio.com/KB/a65/irqbalance-avoid-overloading-cpu-0-with-interrupt-requests.aspx
>>
>> Now, lets say I disable irqbalance which will stop my autobalance and
>> I pin all of my interrupts to core 0 and pin eth0 and eth1 to core 1.
>> My application is network and CPU hungry. I am planning to dedicate
>> cpu 3 to 8 for the application using taskset.  Is there any draw back
>> to this?
> ---
> NO but be aware of what your doing as to not starve out Kernel Threads.
> Whats the kernel? It want hurt to give them priority either. Gbit and
> higher nics I would give them there own cpu.  It may take quit a while
> to come up with the optimal configuration though.
> Example:
> cpu0 app priority 60 - 99 no ionice is app dependent
> cpu1 app
> cpu2 eth0
> cpu3 eth1
> cpu4 fusionio
> cpu5 fusionio
> cpu6 kthreads
> cpu7 kthreads, misc
>
> John
>
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