From: Bernd Eckenfels <firstname.lastname@example.org>
Date: Sat, 7 Sep 2002 00:58:25 +0200
thats why it makes sence to have zerocopy with hw-checksum. there is only a
marginal time needed for a copy+chksum, but it is totally wasted time on
zero copy environment.
You don't understand. Because it is too complicated to zerocopy
arbitrary anonymous user pages, we have to copy it into a stable
kernel buffer. Because we have to copy, we checksum at the
If you want zerocopy for user created data, create a file for
the process, mmap() it, write your contents, then sendfile()
the thing to the socket. End of story.
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