Performance of SheevaPlug on 8-stable

[Rafal Jaworowski]

On 2010-03-08, at 15:29, Maks Verver wrote:

> Next up, this patch:
> 
>> http://www.casselton.net/~tinguely/arm_pmap_unmanaged.diff
> 
> No idea what this does, but it helps a lot:
> 
>  %time ./test
>  9.000u 0.000s 0:09.11 99.2%	40+1324k 0+0io 0pf+0w
> 
> That's much better than the 280+ seconds from before. But it's still
> nearly twice as long as Linux takes.
> 
> There is more weirdness though. If I freshly boot the system I get
> timings like these, and even nbench reports decent scores. However, if I
> do a couple things like rerun/recompile nbench, then at some point
> something 'breaks' and the performance goes back down to what it used to be.

Mark,
Can you confirm this worsening over time happens with a fresh (from scratch) kernel build (with Mark T. patch applied)? Please provide the scenario / steps which lead to this behaviour.

Rafal