Messages in this thread | | | Date | Wed, 30 Apr 2003 21:28:09 +0200 | From | bert hubert <> | Subject | Re: sendfile |
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On Wed, Apr 30, 2003 at 09:12:17PM +0200, P?l Halvorsen wrote:
> It could be useful for applications like streaming video where other > protocols on top provide additional functionality or in a multicast > session where TCP migth not be appropriate.
sendfile on UDP would try to send gigabits per second over ppp0...
> But should not the 2.4.X kernels have support for chained sk_buffs (like > the BSD mbufs) meaning that support for scatter-gatter I/O from the NIC > should be unneccessary to support zero-copy (i.e., NO in-memory data > copy operations)?
No clue what you mean over here. Zero copy means different things to different people. Sendfile eliminates the 'read(to buffer);write(buffer to network);' copy.
Some network drivers again may eliminate the 'copy_with_checksum()' step, allowing minus-one-copy, in zerocopy reference frame.
Regards,
bert
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