Re: RFC: m_tag pool cache

[Roy Marples <roy%marples.name@localhost>]

On 19/02/2016 09:26, Kengo NAKAHARA wrote:
> According to my measurements of using DTrace, there is a certain
> overhead between kern_malloc() and pool_cache_get(). Here is each
> function's average turnaround times in my measurement.
> 
>     m_tag_get            | 124205 [ns]
>     kern_malloc          | 108007 [ns]
>     kmem_intr_alloc      |  89636 [ns]
>     pool_cache_get_paddr |  65942 [ns]

...

> Here is the patch to introduce mbuf pool cache.
>     http://www.netbsd.org/~knakahara/mtag-pool-cache/mtag-pool-cache.patch
> 
> Could you comment this patch? Any comments are welcome.

And the equivalent numbers with the patch?
As I assume the patch is an optimisation, a suitable speed bump is
expected :)

Roy