Messages in this thread | | | Date | Thu, 02 Dec 2004 02:11:29 -0500 | From | Jeff Garzik <> | Subject | Re: page fault scalability patch V12 [0/7]: Overview and performance tests |
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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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