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Yes, will older processors be further penalized?

Yes, will older processors be further penalized?

Posted May 25, 2011 16:26 UTC (Wed) by ds2horner (subscriber, #13438)
In reply to: The problem with prefetch by rilder
Parent article: The problem with prefetch

I believe your question more succinct than my attempt to raise the issue ( above).

In Andi Kleen's patch (LWN article linked to in the main article), he attempted to have the prefetch remain for list processing on CPUs (namely the K7 family) that would benefit from it.

His approach was to change the prefetch calls to list_prefetch calls and make the list_prefetch a no-op on most rchitectures (and mapping to prefetch via CONFIG_LIST_PREFETCH for MK7 only (presumably with more to be added if they would benefit).

But my main question was, other than the K7 where there is historical "evidence" that this CPU benefited, who would now do the justification for other older processors (like the P3s)?


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