Kristian Høgsberg wrote:
- Always allocate a page for headers and a page for the payload.
This method would not really be acceptable as a replacement for
video1394, since video buffers can often be many tens of megabytes.
Doubling the space requirement would be a big deal and may cause the
allocation to fail.
How about this solution:
Give userspace the option of specifying the exact size of the received
ISO packets. If userspace provides this, you can allocate the dual
buffer descriptors appropriately.
If userspace does not know the exact size of the received ISO packets or
does not specify it, then use dual buffer descriptors for only the first
packet, and use regular buffer fill for the remaining packets.
I suggest this strategy because I can't think of an application that
needs all the packet headers, yet doesn't know the exact size of the
packet. Is there such an application?
-David
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