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SubjectRe: [RFC] Direct Sockets Support??
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> A couple of concerns I have:
> * How to pin or pagelock the application buffer without
> making a kernel transition.

You need to pin them in advance. And pinning pages is _expensive_ so you dont
want to keep pinning/unpinning pages

> * Assuming the memory can be locked down, how can a list
> of physical memory ranges be obtained (necessary to support
> scatter/gather DMA? Is kiobufs suitable with it's page-alignment
> constraints? If kiobufs will work, how can the kernel transition be
> avoided?

kiovecs will do that. It might be a little heavyweight but that should improve
in 2.5 as we move to a slightly lighter model

> WinSock Direct seems to address these concerns. These issues
> become important at 1Gb and 10Gb speeds.

1Gbit - not really, 10Gbit yes
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