Messages in this thread | | | Date | Sat, 03 Jun 2006 17:52:46 -0600 | From | Robert Hancock <> | Subject | Re: memcpy_toio on i386 using byte writes even when n%2==0 |
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H. Peter Anvin wrote: > For something that generates I/O transactions, it's imperative to > generate the smallest possible number of transactions. Furthermore, > smaller than dword transactions aren't burstable, except at the > beginning and end of a burst.
Well, theoretically for writes they could be, if the memory region was prefetchable and the PCI chipset supported byte merge. It certainly isn't optimal however.
-- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@nospamshaw.ca Home Page: http://www.roberthancock.com/
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