Re: 2.6.15-rc5-rt2 slowness

K.R. Foley
2005-12-20T15:30:13Z

Ingo Molnar wrote:
> * Steven Rostedt <rostedt@goodmis.org> wrote:
>
>>>> Now, is the solution to bring the SLOB up to par with the SLAB, or to
>>>> make the SLAB as close to possible to the mainline (why remove NUMA?)
>>>> and keep it for PREEMPT_RT?
>>>>
>>>> Below is the port of the slab changes if anyone else would like to see
>>>> if this speeds things up for them.
>>> ok, i've added this back in - but we really need a cleaner port of SLAB
>>> ...
>>>
>> Actually, how much do you want that SLOB code? For the last couple of
>> days I've been working on different approaches that can speed it up.
>> Right now I have one that takes advantage of the different caches.
>> But unfortunately, I'm dealing with a bad pointer some where that
>> keeps making it bug. Argh!
>
> well, the SLOB is mainly about being simple and small. So as long as
> those speedups are SMP-only, they ought to be fine. The problems are
> mainly SMP related, correct?
>
> Ingo

No. I experienced horrible performance running the original patch with
the SLOB on my uniprocessor system vs. the patch with Steven's SLAB
patch applied on the same system. In fact I am currently running the
latter on that system now. With the original patch the system is really
unusable.

--
kr