RE: [patch] sched: auto-tune migration costs [was: Re: Industry db benchmark result on recent 2.6 kernels]

[Chen, Kenneth W]

Ingo Molnar wrote on Sunday, April 03, 2005 7:30 AM
> how close are these numbers to the real worst-case migration costs on
> that box?

I booted your latest patch on a 4-way SMP box (1.5 GHz, 9MB ia64). This
is what it produces.  I think the estimate is excellent.

[00]:     -    10.4(0) 10.4(0) 10.4(0)
[01]:  10.4(0)    -    10.4(0) 10.4(0)
[02]:  10.4(0) 10.4(0)    -    10.4(0)
[03]:  10.4(0) 10.4(0) 10.4(0)    -
---------------------
cacheflush times [1]: 10.4 (10448800)


One other minor thing: when booting a numa kernel on smp box, there is
a numa scheduler domain at the top level and cache_hot_time will be set
to 0 in that case on smp box.  Though this will be a mutt point with
recent patch from Suresh Siddha for removing the extra bogus scheduler
domains.  http://marc.theaimsgroup.com/?t=111240208000001&r=1&w=2


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