Re: page fault scalability patch V12 [0/7]: Overview and performancetests

[Jeff Garzik]

Benjamin Herrenschmidt wrote:
> They may not end up in order if they are stores (the stores to the
> taskfile may be out of order vs; the loads/stores to/from the data
> register) unless you have a spinlock protecting both or a full sync (on
> ppc), but then, I don't know the ordering things on x86_64. This could
> certainly be a problem on ppc & ppc64 too.


Is synchronization beyond in[bwl] needed, do you think?

This specific problem is only on Intel ICHx AFAICS, which is PIO not 
MMIO and x86-only.  I presumed insw() by its very nature already has 
synchronization, but perhaps not...

	Jeff


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