Fab Tillier wrote:
The user would need to know how large of a buffer to allocate for the read.
If the user needs to allocate two buffers, then they either need to be
able to process data the spans multiple buffers, or a second data copy is
required. There's also an issue if the user is using multiple threads...
Ok, so my idea sucked. What about not coalescing in the kernel, and just
handing up MADs to be coalesced in user-mode? It would require a buffer
allocation in UM, as well as copies, but those currently happen in the kernel
and could be eliminated, no?
Nah... your idea was fine as something to throw out. :)
Currently, only a single data copy is performed to transfer received RMPP
MADs from the kernel to a usermode app. The coalescing occurs as the data
is copied from a chain of MADs in the kernel to the app's buffer.
- Sean
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