Re: 2.6.8-rc2-mm2 performance improvements (scheduler?)

["Martin J. Bligh" <mbligh@aracnet.com>]

--On Wednesday, August 04, 2004 12:24:14 -0700 Andrew Morton <akpm@osdl.org> wrote:

> "Martin J. Bligh" <mbligh@aracnet.com> wrote:
>> 
>> SDET 8  (see disclaimer)
>>                             Throughput    Std. Dev
>>                      2.6.7       100.0%         0.2%
>>                  2.6.8-rc2       100.2%         1.0%
>>              2.6.8-rc2-mm2       117.4%         0.9%
>> 
>>  SDET 16  (see disclaimer)
>>                             Throughput    Std. Dev
>>                      2.6.7       100.0%         0.3%
>>                  2.6.8-rc2        99.5%         0.3%
>>              2.6.8-rc2-mm2       118.5%         0.6%
> 
> hum, interesting.  Can Con's changes affect the inter-node and inter-cpu
> balancing decisions, or is this all due to caching effects, reduced context
> switching etc?
>
> I don't expect we'll be merging a new CPU scheduler into mainline any time
> soon, but we should work to understand where this improvement came from,
> and see if we can get the mainline scheduler to catch up.

Dunno ... really need to take schedstats profiles before and afterwards to
get a better picture what it's doing. Rick was working on a port.

M.

PS. schedstats is great for this kind of thing. Very useful, minimally 
invasive, no impact unless configed in, and nothing measurable even then.
Hint. Hint ;-)