Re: > 1GB on alpha. Patch to 1TB?
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>>>>> "Jay" == Jay Estabrook <Jay.Estabrook@digital.com> writes:
Jay> On Alpha, in addition to the direct-map DMA windows which are currently
Jay> used, one can define what we call "scatter-gather" DMA windows. The range of
Jay> PCI addresses that fall into one of these windows are re-directed to host
Jay> memory via a page table, where the address in a PTE can be *any* page in the
Jay> possible installed memory - no bounce buffers needed... :-)
I suspect this is what the original poster was referring to. In any
case, for 2.3 at least, this would be the best target to shoot for, IMO.
How much effort would be required to implement this scheme? If the
`scatter-gather' were set up at device resolution, rather than page
resolution, would the drivers even require modification?
- -JimC
- --
James H. Cloos, Jr. <http://www.jhcloos.com/cloos/public_key> 1024D/ED7DAEA6
<cloos@jhcloos.com> E9E9 F828 61A4 6EA9 0F2B 63E7 997A 9F17 ED7D AEA6
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