Re: percpu-2.5.63-bk5-1 (properly generated)

[Martin J. Bligh]

> There's a relatively large (12s/44s == 27%) difference between absolute
> timings on our machines, which suggests a large disturbance in the force.
> 2.5.63-bk5 virgin appears to get timings in the low 40's.

Did you actually read the previous email? 
Same config file? Same tree? same compiler (gcc 2.95.4?)

>> Would be useful if you can grab a before and after profile, and see exactly
>> what it is that's getting thrashed that you're fixing (may just be everything).
> 
>> From the profile posted it's the division in page_zone().

I think we're talking about different things:

1. Need to isolate what's causing the 6s improvement you're seeing.
Can you generate profiles & time output for before and after the patch,
and describe the test you're running (presumably make -j).

2. SDET degredation. I'll try the additional patch you sent out on that.

M.