Re: [PATCH] top level scheduler domain for ia64

[Xavier Bru <xavier.bru@bull.net>]

Hello Nick & all,

Nick Piggin wrote:

> Luck, Tony wrote:
>
>
>> +    .min_interval        = 80,            \
>> +    .max_interval        = 320,            \
>> +    .busy_factor        = 320,            \
>> +    .imbalance_pct        = 125,            \
>> +    .cache_hot_time        = (10*1000000),        \
>> +    .balance_interval    = 100*(63+num_online_cpus())/64,   \
>>
>> That's a lot of magic numbers and formulae ... are they right?
>> How would a user know if they are right.
>>
>
> To be honest you really wouldn't. It would take a lot of careful
> testing on numerous workloads and systems. I believe SGI is
> starting to do a bit of testing... I don't have the resources to
> do many "real world" tests.
>
> At this stage I wouldn't let them worry you too much :P
> Hopefully they'll gradually improve.

Why should'nt we use the node_distance() function to build in an 
independant way the Numa hierarchy and compute the right parameters for 
each level ?


-- 

 Sincères salutations.
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Xavier BRU                 BULL ISD/R&D/INTEL office:     FREC B1-422
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